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How do we actually know that a species is totally extinct?

Topic: Science ,    Subtopic: Zoology Tags: animals extinction zoology species

How do we actually know that a species is extinct if we cannot check thoroughly enough to be 100% sure?...

asked: UTC 2020-10-21 11:14 PM
image NickG (310)
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What are the largest land mammals found in the wild in the US?

Topic: Science ,    Subtopic: Zoology

Africa has so many large wild land mammals, so it's interesting to think about the mammals found in the wild in the US. The largest I can think of is some kind of bear possibly? What is the largest land mammal found in the wild in the US?...

asked: UTC 2020-11-19 02:07 AM
image daina52 (95)