___________ is a group of cells similar in structure and function.

Tissue

The correct answer is Option (3) –Tissue

A tissue is a group of cells similar in structure and function.

Explanation: Tissues are groups of cells that are similar in structure and work together to perform a specific function in an organism. They are the building blocks of organs. Different types of tissues exist in the body, each specialized for specific tasks. For example, epithelial tissue forms the outer layer of the skin and lines internal organs, providing protection and facilitating the exchange of substances. Muscle tissue is responsible for movement, while nervous tissue conducts electrical impulses throughout the body. Connective tissue supports and connects various body structures. Overall, tissues are essential for the proper functioning of organs and organ systems in multicellular organisms.