Because people and animals exhale carbon dioxide which plants need and they release oxygen
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Los protones tienen una carga positiva. Los electrones tienen una carga negativa. La carga del protón y del electrón son exactamente del mismo tamaño, pero opuestas.
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Puppies from the same litter commonly share 50% of their genes (on average.) Each litter mate randomly inherits 50% of its genes from his father and the other 50% from his mother. The only thing here is that they do not necessarily the same 50% from each
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