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Wood first appeared in plants called progymnosperms.
From space earth shows itself as a planet covered mostly by water.
The meninges from the outside in: dura mater, arachnoid, and pia mater. Also showing the subarachnoi
Herniated disk. A herniated disk is a protrusion of the disk’s gelatinous center, called the nucleus
Blue light is scattered more than other wavelengths by the gases in the atmosphere, giving the Earth
Earth emits radiation back out to space from all surfaces, both day and night