(a)   is produced by the kidney.

There is a lot of part of nephron and the number one is (a)  

The urine formation is consist of (a)   main steps

In this organ occurs gas exchange between .... and ....

(a)  

There is a process in proximal contortus tubule and produce (a)  

In the excretory system, we find this organ which produces bile liquid. It called (a)  

The result of filtration is (a)  

Obtaining food is how living things get their energy. This picture can help human manage their energy needs. We knew it and we call it (a)  

If we drop iodine into food and the colour change to blue-black. It means that the food contains (a)  

What is the first organ in the digestive system?

(a)  

Before the food goes to the stomach, it will through the...

(a)  

There will be the absorption of food in (a)  

The organ after the small intestine is (a)  

what is the content of rice?

(a)  

This picture describes how enzyme (a)  

lipase is an enzyme made in (a)  

The last organ in the digestive system is (a)  

There is a process in the distal contortus tubule called (a)  

There are (a)   organs in the excretory system