Why does every offspring get 2 alleles for every characteristic

Sure thing, i’ll you

Well,what i learned was that unlike many other  endothermic  reactions,  photosynthesis  does not absorb energy as heat. instead, during plants absorb energy from sunlight to turn carbon dioxide and water into oxygen and glucose, which is a type of sugar molecule. the energy is stored in the glucose molecules, ready to be used when needed. 

Answeris longer than the total refractory period for skeletal muscle;