Concept covered: recap and review answer each question to complete this review of all the stages of respiration

Respiration is a very important process that happens in all living things. It is the way in which our bodies release energy from the food we eat. When your hand is above your head, the flow of blood is reduced. This means the supply of glucose and oxygen to the cells is limited, they respire less, and release less energy. Therefore, the cells get tired more quickly and ache more readily. Pupils may also account for their results by discussing anaerobic respiration.

It is evolution, because we all have some of the same traits like eye color or shape or ears.