I believe that this is the food chain. Not sure what you mean by "living factors."
The environment, climate, and other plant/ animal life that is around. Plants and animals adapt to their habitat which involves the annual climate patterns, where it lives, and the plant and animal life that surrounds it.
WHere an animal or plant lives is a Habitat.
A parasite.
A parasite
parasite
A parasite.
The answer is "parasites"
A parasite.
parasites
A parasite
A parasite