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Wood first appeared in plants called progymnosperms.
The platypus is very difficult to spot even on the surface of a river.
Sunda Clouded Leopard in lower Kinabatangan River, eastern Sabah, Malaysia
Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r
A negative feedback loop.
Cancer cells can move to new locations in the body, a process called metastasis