What event precedes the powerstroke action of skeletal muscle contractions?

Facilitates growth and change in neurons and the migration of neurons to different sites in the brain

Match the examples to the correct level of organization. 1. system level roses, snakes, puppies 2. organism level roots, stamens, leaves 3. tissue level bone, cartilage, blood 4. organ level heart, veins, arteries

Anton created a chart listing different types of materials. which best complete the chart?