Answer:
A is true..... by law of conservation of energy
Valves ensure blood flows toward your heart. Vein valves work to bring the blood that flowed down via arteries back up to your heart.
C. Law of segregation is the Mendel's law that states that gametes carry one allele for each trait.
Photosynthesis. These are the reactants for photosynthesis and the products of cellular respiration.
