What does ''living things do not exist in isolation'' mean?

Question

What does ''living things do not exist in isolation'' mean?

Answer 1

It means that things can't live without other creatures supporting it.

For example: an ecosystem. Every animal depends on another one or a plant in order to feed.

A living thing must reproduce, move, obtain energy, and use energy.

They must get energy from living things or be fed by other creatures.

Answer 2

It means they cannot live alone or by themselves. They have to live around others or with others to survive.