We know that many plant and animal species are dying out.
A.Many plant and animal species are known to be dying out.
B.Many plant and animal species is known to be dying out.
C.It was known that many plant and animal species are dying out.
D.Many plant and animal species are known to die out.
A.Many plant and animal species are known to be dying out.
B.Many plant and animal species is known to be dying out.
C.It was known that many plant and animal species are dying out.
D.Many plant and animal species are known to die out.
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