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They give us the very start to a food chain, and food chains on earth as we experience them are how energy is transferred between life forms (predator and prey) and are the key to survival, they use the suns energy in the form of photons-- bugs eat plants---birds eat bugs--- and so on.

Plants have also got certain medicinal properties and without modern technology would be key to our survival to make shelters, etc.

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14y ago

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