Cells that preform similar functions combine from which term best completes the sentence?
a. tissues
b. organ systems
c. organs
d. organisms

 A. Tissues

Cells that perform similar functions combine to form tissues.

Explanation:

Cells are the smallest units in the body of an organism. Based on number of cells in an organism’s body they can be classified as unicellular or multicellular organisms.

It is the group of cells performing similar functions that form a tissue.  Group of tissues performing similar function forms an organ. Tissue structure and function may differ in plants and animals.

Animal tissues are classified into four. They are epithelial tissue, connective tissue, nervous tissue and muscle tissue. In plants there are three tissue systems namely the epidermis, vascular tissue and the ground tissue.

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