Elton included a series of proverbs in his book that captured simple truths about the organization of nature. “Large fowl cannot eat small grain” was one saying about the sizes of creatures and the food they ate.

friedrich meischer discovered it in white blood cell

in addition to being able to metabolize, grow, digest food, and excrete wastes, what other functions must an organism perform if it is to survive? survival also depends on the ability to maintain one's boundaries, to move, to respond to stimuli, and to reproduce. oxygen is a survival need.