Why did the scientists assume the plants and animals they encountered in the cloud forest on top of New Guinea's Foja Mountains had never been encountered by other humans before?

Question

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The scientists assumed that the plants and animals they encountered in the cloud forest on top of New Guinea's Foja Mountains had never been encountered by other humans before because (A) these species were unknown to even the native peoples, (B) the animals were unafraid of humans, and (C) they found some species that were thought to have been extinct for decades. Therefore, all of the answer options except D are correct.

Why Did the Scientists Assume the Plants and Animals They