Introductory Biology (CK-12)
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Thumbnail: Monarch butterfly (Danaus plexippus), Central Park, New York, USA. (CC BY-SA; 3.0; Spinus Nature Photography (Spinusnet))
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Thumbnail: Monarch butterfly (Danaus plexippus), Central Park, New York, USA. (CC BY-SA; 3.0; Spinus Nature Photography (Spinusnet))