In most of the invertebrates, kidneys are present for excretion.

The passage of which of the following makes the urine hypertonic?

In the majority of nephrons, the loop of Henle is too large.

The gradient of osmolarity is mainly caused by NaCl.

Which of the following is not correct regarding PCT?

Excretion of which of the following is for the adaptation of water conservation?

What happens when the filtrate passes through the ascending loop of Henle?

Inside the kidney, there are three zones.