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Wood first appeared in plants called progymnosperms.
Cnidarians have specialized stinging cells called cnidocytes
Reindeer antlers grow again each year under a layer of fur called velvet. This reindeer is losing th
Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican
People whose behaviors violate norms are often called mentally ill. “Why else would they do such ...
A square matrix P is called a permutation matrix if each row and column of P contains exactly ...