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sineoko [7]
3 years ago
5

6. When humans first appear on Earth?

Biology
1 answer:
vaieri [72.5K]3 years ago
6 0

Answer:

seven million years ago

Explanation:

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Which plan wanted equal representation in Congress?
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Answer:

Small-state delegates hoped to protect states' rights within a confederate system of government. Fearing the effects of majority rule, they demanded equal representation in Congress, as was practiced under the Articles of Confederation and assumed in William Paterson's New Jersey Plan.

Explanation:

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2 years ago
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How are hormone levels regulated?
sukhopar [10]

The correct answer is 2. By a feedback loop.

Hormone levels in the body is regulated by negative feedback mechanism. In this mechanism, a stimulus stimulates the release of a substances. After the effect of that substance its further release is inhibited. This can be understood by an example, the anterior pituitary gland stimulate the thyroid gland to release thyroxin and on increasing the thyroxin in the blood, feedback the hypothalamus and anterior pituitary to inhibit further release of thyroxin from thyroid gland.

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2 years ago
_____ is 10 to 20 times higher inside the cell, and _______ is 10 to 20 times higher outside the cell.
wolverine [178]

Potassium is 10 to 20 times higher inside the cell, and sodium is 10 to 20 times higher outside the cell. The potential difference across the cell is important in several processes such as transmission of nerve impulses and maintain the ion balance.

The sodium concentration higher out side and potassium higher inside the cell then it moves two potassium into the cell where potassium levels are high and pump three sodium ions out of the cell and into the extracellular fluid.

This is due to action of membrane active transport system which pumps sodium out of the cell and potassium into it. Both helps in body maintain flid and blood volume so it can function normally.

To learn more about active transport system here

brainly.com/question/15454163

#SPJ4

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1 year ago
WILL GIVE BRAINLIEST
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D. Some organisms would not be well-adapted to the higher temperatures.
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