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rusak2 [61]
3 years ago
14

"Solar storms, like the one in the video, may have caused a dramatic increase in nitrous oxide in Earth's early atmosphere, allo

wing it to warm enough to support life. What is the earliest life form found in the fossil record? Choose one: A. stromatolites B. trilobites C. cyanobacteria D. cells from an unknown organism"
Biology
1 answer:
omeli [17]3 years ago
5 0

Answer:

Option C

Explanation:

The cyanobacteria is the oldest life form that once existed on planet earth some 3.7 billion years ago. These cyanobacteria formed layered structures fossils which are called as stromatolites

Hence, stromatolites are the fossilized colonies of cyanobacteria.

A set of rocks in Greenland show the evidence of cyanobacteria as a living organism.

These stromatolites have layered structure of bio-chemical accretionary that are produced by trapping sedimentary grains through biofilms of microorganisms such as cyanobacteria.

Hence, option C is correct

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When 2 or more plant proteins are combined to compensate for deficiencies in essential amino acid content in each protein, the p
My name is Ann [436]

Answer:

b. complementary proteins

Explanation:

Complementary proteins are proteins that contain all adequate amounts of the essential amino acids when two or more protein sources that are deficient or low in some amino acids are combined together to compensate for the deficiency of the other. The protein sources can be eaten together in a meal or consumed the same day to get a complete protein.

For example, grains are deficient in lysine, while legumes are usually deficient in methionine.  Combination of rice which is a grain, together with beans which is a legume, would give us complementary protein diet, making it a complete protein source with all adequate essential amino acids available.

6 0
4 years ago
Describe steps that can be taken to improve water quality through water conservation
Tanya [424]

Answer:

While trying to conserve water, we can boil it or purify it through water purifiers so that it may be recycled.

Explanation:

6 0
3 years ago
Name at least one difference between eubacteria and archaebacteria.
Stolb23 [73]
Archaebacteria are called ancient bacteria whereas eubacteria are called true bacteria. Unlike eubacteria, archaebacteria can survive in extreme conditions.
5 0
3 years ago
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What is the function of RBC
avanturin [10]

Answer:

When a red blood cell is placed in a hypertonic solution, it contracts as water is drawn out of the cell and into the surrounding solution. If the same blood cell is placed in a hypotonic solution, the blood cell grows in size. Blood cells in isotonic solutions do not shrink or swell.

The reason that blood cells change in size when placed in a solution with different salt concentration is due to the osmosis process. Osmosis causes solutions with high concentrations of salt to draw water from areas with low concentrations of salt.

There are some exceptions to this phenomenon. Blood cells can draw water and explode when placed in hypertonic solution on some special occasions. Some diseases affect the structural integrity of blood cells. Also, when human blood cells are exposed to temperatures close to freezing, they can draw water and explode.

Osmosis is an important phenomenon for living systems. The amount of salt in a given solution exhibits a tendency to diffuse through the environment, eventually resulting in equilibrium. In addition to blood cells, the kidneys function through the use of osmotic principles. The kidneys filter an animal's blood to remove excess salt and balance the amount of water

7 0
3 years ago
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Answer:

trophic

Explanation:

It follows that the carnivores (secondary consumers) that feed on herbivores and detritivores and those that eat other carnivores (tertiary consumers) have the lowest amount of energy available to them.

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