Question

cell are called structural and functional unit of life . why

Answer 1

Cells are called structural and functional unit of life because cells combine to form different tissues which in turn forms organ and these organs form organ systems. And as all the function taking place in our body are performed by cells they are called functional unit too.

Answer 2

$\huge\underline\mathfrak{Answer}$

1) Because all the living organisms are cellular in nature and life exists only in the cells.

2) All the cells have similar basic structure.

3) Similar cell organelles of different cells perform similar functions in a similar manner .