Organisms rarely exist alone in the natural environment. Why?

Question

Oh, I only need a brief explanation on WHY Organisms rarely exist alone in the natural environment.

Answer 1

Organisms have interconnecting relationships with other living things in the environment. Other living things provide food, shelter from the elements and from predators, shade, and so on. Plants can't live without decomposers because they need to have nutrients returned to the soil. Animals can't live without plants because plants and other autotrophs start the food chain. There's also a matter of the carbon cycle, the nitrogen cycle, ....

Answer 2

Most have found beneficial relationships, a form of symbiosis. Almost all animals and plants have parasites or predators. Usually reproduction requires more than a single individual.

Answer 3

They depend on other life forms, whether it be through mutalism, commensalism or parasitism.