The sweet potato is an example of the Calvin cycle in which a series of reactions, occuring during photosynthesis,  is synthesized from carbon dioxide.

Butter is a lipid which stores energy.

Eubacteria, which is contained in yogurt, produces vitamins which can be very helpful to humans.

Our hands contain connective tissue where we are able to move our fingers more freely.

When any fruit reaches maturity, like this apple for example, it releases ethylene which promotes the ripening of the fruit.