<span>it has to be in living organisms, it has to have a plasma membrane and it has to arise from a previously existing cell.</span>
Chloroplasts - found only in plants and algae. they convert solar radiation energy to chemical energy usable for the cell's metabolism.
mitochondria - found in both plants and animals, they produce energy (in the form of ATP - chemical compound) by decomposing sugars and fats. they use up oxygen to do it.
The digestive system enlists the aid of the cardiovascular system and the nervous system. Blood vessels of the digestive system widen to transport more blood.
Process A likely describes a photosynthesis whilst process B describes respiration.
