Question

What is a group of specialized cells called when they work together to perform a specific function?

Atom
Organ
Organ system
Tissue

Answer 1

Tissue, like a muscle.

Step-by-step explanation:

A tissue, such as a muscle, is formed through the cooperation of groups of specialized cells. Different tissues are then combined together to create organs, which are bigger functional units. Each cell, tissue, and organ has a unique structure and set of functions that benefit the entire organism.