The mitotic spindle is composed of protein fibers called that coordinate the movements of during mitosis.

d statement

explanation:

carbon atoms, hydrogen, oxygen, and nitrogen.

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.