ANATOMY

Detailed explanation-1: -Final answer: A group of cells performing a particular function is tissue.

Detailed explanation-2: -A group of similar cells which perform a specific function is called a tissue.

Detailed explanation-3: -Organ-a group of tissues precisely arranged so that they can work together to perform specific functions.

Detailed explanation-4: -Tissue is a group of cells that have similar structure and that function together as a unit. Primary types of body tissues include epithelial, connective, muscular, and nervous tissues.

Detailed explanation-5: -Complete answer: The Group of tissues performing particular functions in the body is called an organ or an organ is a structure composed of at least two or more tissue types.