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Wood first appeared in plants called progymnosperms.
Reindeer antlers grow again each year under a layer of fur called velvet. This reindeer is losing th
Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r
The neural pathway responsible for the production and learning of song in the male canary.
The effects of neonatal testosterone exposure on the size of the sexually dimorphic nuclei in male ...
G-banded karyotype of a normal human male