Question

select the part whose main job is to give the cell its fixed shape. mitochondria smooth endoplasmic reticulum cell wall ribosome

Explanation:

The cell wall is a rigid structure that surrounds the cell membrane in plant cells, fungi, and some bacteria. It provides structural support and protection, giving the cell its fixed shape. Mitochondria are the powerhouses of the cell, responsible for producing energy. The smooth endoplasmic reticulum is involved in lipid synthesis and detoxification. Ribosomes are responsible for protein synthesis.

Answer:

cell wall