Question

Why does an Ameba change it's shape?

Answer 1

Amoeba changes it's shape because it does not have a rigid pellicle to retain it's shape. It extends it's cytoskeleton using pseudopodia( false feet). pseudo - means false and podia - means feet. It uses them for locomotion and for different purposes. Such organisms which have ability to change their shape are called pleomorphic organisms.

Answer 2

as it is unicellular to catch it prey and to move forward it changes its shape.