Question

give the correct answer..?​

Answer 1

Answer:

The rate of breathing in aquatic organisms is much faster than in terrestrial organisms because the amount of dissolved oxygen is fairly lower in water than air and also that aquatic organisms like the fishes obtain oxygen from water present in the dissolved state.

Answer 2

$\underline\mathtt\pink{6. \:Answer:}$

The process of removal of the toxic waste products produced due to cellular activities is called excretion.

$\underline\mathtt\pink{7. \:Answer:}$

Basic filteration unit present in kidney is called nephron.

$\underline\mathtt\pink{8. \:Answer:}$

The rate of breathing in aquatic organisms is much faster than in terrestrial organisms because the amount of dissolved oxygen is fairly lower in water than air and also that aquatic organisms like the fishes obtain oxygen from water present in the dissolved state.

$\underline\mathtt\pink{9. \:Answer:}$

In human beings, the blood goes through the heart twice during each cycle, i.e. the blood passes through the human heart two times to supply once to the whole body. So, it is called Double Circulation of blood.

It is necessary because:

Double circulation in human beings allows the separation of oxygenated and deoxygenated blood in the body. It helps in maintaining a high blood pressure required for essential processes. It enables pure blood to reach the different tissues and organs of the body like kidney, liver, etc.

Hope it helps ☺️!