A multicellular organism develops from a single cell.
Telomerase is found in fetal tissues, adult germ cells, and also tumor cells. Telomerase activity is regulated during development and has a very low, almost undetectable activity in somatic (body) cells. Because these somatic cells do not regularly use telomerase, they age.
Photosynthesis is using Light Energy to convert CO2 and water into oxygen and carbohydrates such as sugar or starch.
Cellular respiration is using oxygen to convert biochemical energy into ATP (Energy) and CO2
The relationship between the 2 is that what the 2 creates and let out is what the other needs to work like photosynthesis creates oxygen as a byproduct and to do cellular respiration, it needs oxygen. Cellular respiration creates CO2 as a byproduct and to do photosynthesis, it needs CO2.
ATP, adenosine tryphosphat. And some kind of protein integral that placed in membrane