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nobody really knows.... it was so long ago it's almost impossible to know for sure when and how.

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12y ago

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How does spring come?

The sun gets closer to the earth and causes the earth to a perfect climate for plants and animals to procreate.


Which part of Earth's system is made up of plants and animals?

Biosphere= the part of the earth where plants and animals live.


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The carbon dioxide that plants take in come from animals. The oxygen that animals take in come from the plants.


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What chemical substance is found in the earth but not formed by plants or animals?

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Unicellular plants and animals were first forms of life on Earth


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What do you call the rich variety of animals and plants on the earth?

The rich variety of animals and plants is biodiversity.


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plants need carbon dioxide which come from animals respiration


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