Stomata SEM
Scanning electron microscope (SEM) micrograph showing multiple open stomata (gas exchange pores) on the underside of a common ivy (Hedera helix) leaf, at a magnification of 600x, 2016. The random distribution of stomata is typical of the dicot plant group, of which hedera helix is a member. (Photo by Smith Collection/Gado/Getty Images).

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