Question

how can you say earth is the main source for all living beings and especially for human beings​

Answer 1

Answer:

how can you say earth is the main source for all living beings as earth has a suitable climate to develop ecosystem.

Explanation:

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Answer 2

Earth is the main source of all living beings and especially for human beings because they are adapted and moreover our body is made such that raises the temperature of the earth and not any other planet. moreover each planet has its own living things which get adapted to that particular atmosphere ... the only thing is we don't know those people and hence we call them aliens. .. ☺