“the contraction and relaxation of skeletal muscles moves bones” is this related to A. circulatory B. respiratory C. Muscular

Which medullary index indicates a human hair? a. 0.653 b. 0.733 c. 0.516 d. 0.256

Kelly ran electricity though a sample of water using electrolysis. the water changed into two gases, x and y. it was not possible to break down the gases x and y into simpler particles.

How can an organ, such as the lungs, work for multiple body systems?