What are variations? How do they help organisms?

What is a variation ?

What are pneumatic bones ? How do they help birds ?

What is transport system ? How does this help to the organism?

What are antibodies? When do they develop? How they help us?

What is emulsification ? How does it help in digestion of fats ?

Observe seeds in a pea or bean pod. You may observe several parts to arrive at a generalisation. (Q) C. Why are variations important? How are variations useful for an organism or a population?

What are photoreceptors? How do they sense light?