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Reindeer antlers grow again each year under a layer of fur called velvet. This reindeer is losing th
As some groups do ethnic work, they produce a mythical long-lost heritage, as in this photo of ...
Conservation biology arose in response to biodiversity loss
Cancer cells can move to new locations in the body, a process called metastasis
Example of inflammation as a response to bacterial infection.
Experiments showing that long- or short-day plants flower in response to night length. Each horizont