we study plants and animals.( 变为否定据)

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westudyplantsandanimals.(变为否定据)westudyplantsandanimals.(变为否定据)westudyplantsandanimals.(变为否定据)wedon''t

we study plants and animals.( 变为否定据)
we study plants and animals.( 变为否定据)

we study plants and animals.( 变为否定据)
we don't study plants or animals.