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The xylem in plants are responsible for

The kidneys in human beings are a part of the system for

How is the amount of urine produced regulated?

What are the methods used by plants to get rid of excretory products?

Describe the structure and functioning of nephrons.

How is food transported in plants?

How are water and minerals transported in plants?

What are the components of the transport system in highly organised plants?

Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?

What are the components of the transport system in human beings? What are the functions of these components?