Answer:
A good index fossil is one with four characteristics: it is distinctive, widespread, abundant, and limited in geologic time. Because most fossil-bearing rocks formed in the ocean, the major index fossils are marine organisms.
Explanation:
Fossil to be a good index fossil are:-
Had a broad geographic distributionEasy to identify at the species levelAn invertebrateShort-livedWhat is a fossil?Fossils are the preserved remains, or traces of remains, of ancient organisms. Fossils are not the remains of the organism.They are rocks. A fossil can preserve an entire organism or just part of one. Bones, shells, feathers, and leaves can all become fossils.Hence, All the given option are correct.
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1. Which of the following characteristics is possessed by invertebrates?
a) exoskeleton
b) endoskeleton
c) joint appendages
d) cephalization
Answer: a) exoskeleton
Explanation:
Well, many invertebrates – and all arthropods – have a protective external casing called an exoskeleton. This literally means ‘outside skeleton’ and its role is to cover the animal’s soft tissues and also provide a rigid structure to which the creature’s muscles can attach.
the group of cells that use chemicals to recycle elements in the blood are called
a.muscles
b.glands
c.hormones
d.oxygen
Explanation:
I'm guessing the answer is oxygen.
The oxygen cells are a type of cell that uses chemicals to recycle elements in the blood.
What is oxygen cells?Red blood cells, also known as erythrocytes, transport oxygen to your body's tissues. Your tissues emit carbon dioxide as oxygen is converted into energy. Red blood cells also transport carbon dioxide to your lungs for exhalation. Cells require oxygen to efficiently use glucose in cellular respiration. This is how most organisms obtain energy. When oxygen binds to parts of glucose molecules, water, carbon dioxide, and energy are released. After all, the organism uses the energy to create adenosine triphosphate (ATP). A type of blood cell found in the blood that is produced in the bone marrow.To learn more about oxygen cells, refer to:
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Fraternal twins, while conceived at the same time, are not genetically identical.
Which statement best explains why these siblings are genetically different from each other?
A.One chromosome from each pair randomly passes to the sex cells during meiosis and leads to differences between the siblings.
B.One chromosome from each pair randomly passes to the sex cells during fertilization and leads to differences between the siblings.
C.Mutations occur during meiosis and lead to differences between the siblings.
D.Mutations occur during fertilization and lead to differences between the siblings.
Fraternal twins are not genetically identical because one chromosome from each pair randomly passes during meiosis and leads to differences between the siblings. Meiosis involves independent segregation of sex chromosomes.
Meiosis is a type of reductional cell division by which a parent cell produces four daughter (gametes) cells having half the genetic material.
Fraternal twins occur when two egg cells are released by the mother, which are fertilized by a different sperm.
During meiosis, sex chromosomes are separated and segregate in a random manner in daughter (sex) cells.
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What is dead air in zoology?
Answer:
the volume of air that is inhaled that does not take part in the gas exchange
Give reasons :
a) Nylon clothes should not be worn in the kitchen.
b) Cotton fibre is used to make bath towels.
c) Umbrellas and raincoats are made from synthetic fibres
Answer:
a) It is dangerous to wear nylon clothes while cooking because it is a synthetic cloth and they catch fire easily also they can stick on our body which is very painful.
b) Cotton is a natural product. And unlike synthetic fibres, it is more absorbent. The towel hence has high absorbency.
c) Nylon and polyester are two fabrics most commonly used in raincoats and umbrellas. They are not absorbent the way natural fibers are. They naturally resist waterlogging, and can be made waterproof.
Which type of cell-to-cell junction joins intermediate filaments ( keratins) in one cell to the basal laminate; welding down the cells of the epithelial and providing tensile strength?
A. Right junction
B. Desmosomes
C. Gap junction
D. Hemidesmosome
E. Adherents junction
Answer:
Desmosomes
Explanation:
Desmosomes Connect Intermediate Filaments from Cell to Cell
Through desmosomes, the intermediate filaments of adjacent cells are linked into a net that extends throughout the many cells of a ti
I want a sister I can’t live like this with my parents
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Whats atoms are found in human fat?
Fatty acids are constructed from the chemical elements carbon, oxygen and hydrogen. Fatty acids can be divided into a carboxylic acid head group–hence fatty acid–linked to a long chain of carbon atoms.
does that help?
3. Explain why unmanned marine vehicles are so useful provide specific examples
or facts from the video.
Unmanned marine vehicles are useful because they help with marine tasks, completing them in less time, reducing risks, reaching deeper areas.
Unmanned marine vehicles (UMV) are robotic vehicles controlled from afar that allow us to explore the sea and perform tasks with minimum risks.
UMV is useful because:
They substitute people working at the sea in risky tasks,They allow deeper exploration of the sea.They do tasks in less time than humans.An example of how useful these marine vehicles are is during the construction of ports. They replace divers who have to do the job manually, spending many hours and risking their lives. With a UMV, there is no need for humans to go under the water, experts control the robot from the surface.
In conclusion, UMVs are useful because they are practical tools that save time and reduce risks.
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14. The active site of an enzyme
a. Is where the semi-permeable membrane is located
b. Is a specific bulge of protuberance on an enzyme
C. Is a groove or crevice in the structure of the enzyme into which the substrate fits
d. Rigidly resists any alteration of its shape
The active site of an enzyme
a. Is where the semi-permeable membrane is located
b. Is a specific bulge of protuberance on an enzyme
C. Is a groove or crevice in the structure of the enzyme into which the substrate fits
d. Rigidly resists any alteration of its shape
Answer:-C. Is a groove or crevice in the structure of the enzyme into which the substrate fits.
Explanation:-The active site is one such gap or pocket to which the substrate adapts and binds to the enzyme.
The active site is the region of the enzyme to which the substrate molecule binds and causes a chemical reaction. The active site is composed of amino acid residues that form a temporary bond with the substrate.
Which process involves a cell interpreting DNA?
A- Fertilization
B-Photosynthesis
C-Protein synthesis
D-Cellular Respiration
What is the main function of nucleic acids?
A. provide genetic information
B. long term energy
C. short term energy
D. build muscle, hair, and nails
An instrument is gradually lowered beneath the surface of the ocean to measure the temperature and salinity of the water. The graphs below show the change in temperature at each depth in kilometers below the surface.
Image of two graphs. The left graph has the x axis labeled temperature degree C ranging from 0 to 10. The y axis is labeled depth below surface, km, ranging from negative 1.8 to 0. The line on graph goes up vertically starting at about 2 degree C on the x axis and negative 1.9 km on the y axis. The vertical line goes up staying at about 2 degree C and climbs from negative 1.9 km to about negative 0.8 km. The line starts to shift right at negative 0.6 km. The line shifts to the right from 2 degree C to 5 degree C. The line shifts to right more starting at negative 0.5 km and reaches 10 degree C around negative 0.2 km. The line continues up vertically after negative 0.2 km. The right graph has the x axis labeled salinity ranging from 33.8 to 34.6. The y axis is labeled depth below surface, km, ranging from negative 1.8 to 0. The line on the graph starts at 34 on the x axis and 0 km on the y axis. The line starts to shift to the right at negative 0.1 km and levels out at 34.2 on the x axis. At negative 0.2 km the line shifts to the left and continues to shift left until it reaches negative 0.5 km. The line starts to shift to the right again at negative 0.6 and continues to shift right until it reaches negative 1.9 km on the y axis and 34.6 on the x axis.
What is the most valid conclusion regarding ocean depth temperature, based on the data?
A.) The temperature and salinity increase with increasing depth.
B.) The salinity increases as the depth goes closer to zero.
C.) The bottom of the ocean is frozen and salinity levels are low.
D.) The ocean temperature never rises above 10°C and salinity remains constant.
Answer:
B
Explanation:
The most valid conclusion regarding ocean depth temperature, based on the data, is the salinity increases as the depth goes closer to zero. The correct option is B.
What is an ocean?
An ocean is a large body of salt water. The oceans are divided into seven kinds. But they are interconnected to each other. The ocean is the largest water body, and it is also present in the form of freeze blocks of ice.
The graph is given of the temperature and salinity of the ocean, with the depth of the ocean the temperature of the ocean decreases, and the salinity increases.
The salinity of the water represents the presence of salt in the oceans. It. the graph proves that the salinity increases with the depth, coming closer to the depth.
Thus, the correct option is B.) The salinity increases as the depth goes closer to zero.
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Explain how a reduction in phytoplankton can lead to a reduction in fish populations in the Indian Ocean.
Answer:
This will result in a further decline of the phytoplankton in the Indian Ocean, exaggerating the stress on the marine ecosystem
Explanation:
sorry if im wrong
28 The statements describe four different plants.
Which plant must be a monocotyledon?
A The flowers are wind-pollinated.
B The flowers each have five petals.
The leaves are large with a clear network of veins on them.
The leaves have parallel veins.
Answer:
The leaves have parallel veins
[answers included, 100% on assignment]
1. Compared to today’s corn plant, teosinte:
✔ (c) is shorter and has more branches.
2. About how many genes were involved in producing the dramatic differences between teosinte and modern corn?
✔ (b) 5
3. he gene for which of the following traits changed early in teosinte domestication and caused dramatic changes?
✔ (a) kernel covering
Answer:
C
B
A
Explanation:
Which of the following is a sign of food spoilage?
-a. Soil on unwashed vegetables
-b. Bruised fruit
-c. Bulging or leaking cans
-d. Cloudy egg whites (albumin)
The sign that shows food spoilage is bulging or leaking cans. That is option C.
Food substances can be stored or preserved to prolong the nutritive values and shelf life of the food.
Food spoilage occurs when environmental factors such as:
Light, oxygen, heat, humidity, temperature and spoilage bacteriacauses food to become unsuitable for consumption.
For canned products, bulging or leaking cans shows the food content has deteriorated.
This shows some ongoing fermentation by a spoilage bacteria causing the can to bulge and eventually leak out.
Therefore, the sign that shows food spoilage is bulging or leaking cans.
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Double stranded RNA is cleaved by
Answer:
Dicer
RNA-dependent RNA polymerase amplifies siRNAs by binding to them and making more dsRNA, which is recognized and cleaved by Dicer into secondary siRNAs. The result is the silencing of genes by amplifying the RNAi effect. In certain cases RNAi also silences genes by the formation of heterochromatin.
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Explain how probability theory can be used in agriculture.
Answer:
occurrence
Explanation:
Probability is a mathematical construction that determines the likelihood of occurrence or nonoccurrence of events that are subjected to chance factor. Thus the farmers are interested to know the probability of occurrence of rain before and after spraying. ... In this regard probability plays a great role
The probability theory can be used in agriculture in order to estimate grain yields and thus select which crop is suitable in a calendar year.
What is the probability theory?The probability theory is a model aimed at understanding statistic probabilities in a given problem/issue.
The probability theory involves theoretical, experimental and axiomatic probabilities.This theory (probability theory) is used to analyze random processes such as rain (precipitation) levels.In conclusion, the probability theory can be used in agriculture in order to estimate grain yields and thus select which crop is suitable in a calendar year.
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Which diagram shows a possible sequence of steps in the research and development cycle?
Answer:
B. Problem - Development - Research - Engineering solution
Explanation:
Hope this helps :)
Answer:
c is the anwser because it says engering first than you fund a discovery then development than researching
A white woman says she is not racist but avoids sitting near Black individuals. She has
A.high explicit racism, low implicit racism
B.high explicit racism, high implicit racism
C.low explicit racism, low implicit racism
D.low explicit racism, high implicit racis
N2 is the chemical formula
for what compound?
A. Ammonium
B. Nitrogen gas
C. Nitrite acid
Answer:
B. Nitrogen gas
Explanation:
please asnwer A and B
A. How is the blood in the pulmonary arteries different from blood in other arteries?
B. How is the blood in the pulmonary veins different from blood in other veins?
Pulmonary artery carry deoxygenated blood while are there arteries carry oxygenated blood.
pulmonary vein carries oxygenated blood while the other veins carry deoxygenated blood
Which freshwater biome has the highest organism diversity of all the freshwater biomes?
wetlands
streams and rivers
ponds and lakes
estuaries
Does the light independent pathway of photosynthesis continue to occur when the leaf disks are placed in the dark environment
Yes, the light independent pathway of photosynthesis continues to occur when the leaf disks are placed in the dark environment.
What is photosynthesis?“The process by which green plants make their own food in presence of sunlight, chlorophyll and carbon dioxide is called photosynthesis.”In this process oxygen molecule is released as by product.It has two pathways: light dependent and light independent.
In light dependent pathway, light energy is used by chlorophyll and is converted into chemical energy.In light independent pathway, the energy produced during light dependent pathway is used to convert carbon dioxide into carbohydrates. It occurs in the stroma of the chloroplast.Hence, it is true that the light independent pathway of photosynthesis continues to occur when the leaf disks are placed in the dark environment.
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Aluminum is mined from the ground. Recycling aluminum cans decreases the need for mining bauxite. Paper can also be recycled. How does recycling paper preserve trees?
Answer:
Saving wood
Explanation:
It takes less water to break down waste paper than it does to break down wood. If paper recycling is used to the full potential, wood is only needed once to produce 5 cycles of paper which also means saving waste from landfill 5 times.
What happens when black holes accrete matter too quickly?
Answer:
These objects are called quasars, or active galactic nuclei. However, most black holes are too compact to pull such material — which is mostly gas — in immediately. ... Eventually, the gas is moving so fast that it gets extremely hot and luminous, generating radiation that we can often see from Earth.
Explanation:
Is cloning of endangered species a reliable and acceptable way to repopulate those ecosystems that suffer the loss of important species? Why or why not. (2 paragraph
minimum).
Cloning an extinct species is a possible answer for a suffering ecosystem. The only drawback is that scientists have not yet mastered cloning. When attempting to clone animals often they are deformed and therefore not able to reproduce let alone survive. Even when scientists do manage to clone animals without killing them, it takes many generations of selective breeding to get the species you are trying to revive which takes time, making the ecosystem even more damaged.
The study of a living being is called biology.
The correct answer is not reliable.
The duplication of the genes in the laboratory is called cloning.
The first clone species was the sheep whose name was a dolly.
Those species which are on the verge of extinction is called endangered species and they need extra protection to carry their gene to the next generation.
The cloning will be able to multiply the gene in the in-vitro culture but they will have a direct impact on the natural genes and the combination of the gene present in nature.
The natural species have all the desired genes which help them to survive in nature, whereas the clone species will not have the desired gene which is required to adapt to nature and they will extinct eventually. If these genes pass on to the next generation then the endangered species will also have less chance to survive in nature.
Hence, in my opinion, they cloning is not a suitable way to save endangered species.
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If the gene for not having Albinism (A) is dominant over the gene for having albinism (a). How can two non-albino people have an albino child. which genotype makes this possible?
An insulator the loss of heat energy.
slows down or speeds up
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Answer: Slows down
Explanation: Insulation slows does the transfer of heat energy. think of it like this. a puffer jacket (more insulation) keeps you warmer longer than a t-shirt (less insulation).
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