A group of cells that have the same purpose

Tissue

Explanation:

A group of cells that do the same job is called tissue.

Tissues are groups of similar cells that have a common function. An organ is a structure that is composed of at least two or more tissue types and performs a specific set of functions for the body. Many organs working together to accomplish a common purpose is called an organ system

Explanation:

answer; i believe that the correct answer is (a) restriction);