What is Newton's First Law of Motion? F = MA

Every action has an equal and opposite reaction

Friction

An object at rest stays at rest, an object in motion stays in motion.

answer: a. a gene that causes a specific trait.

b. the carbon cycle ensures living things have a source of hydrogen

i think its control and coordinate because im pretty sure thats what tissue does and the joints are what control movement and then your skeletal/ bones provides portection. hope that .