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from article Citric acid
2D and 3D structures for citric acid. Black = carbon. Red = oxygen. White = hydrogen.
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from article Piciformes
Red-headed woodpecker (Melanerpes erythrocephalus) in Desoto National Wildlife Refuge, Iowa. (Photo by Dave Menke/U.S. Fish and Wildlife Service)
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from article Otter
North American river otter (Lontra canadensis). (Credit: Alan and Sandy Carey/Getty Images)
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from article Otter
Sea otter (Enhydra lutris) in the water off the coast of Moss Landing, California. (Credit: Lilian Carswell/U.S. Fish and Wildlife Service)
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from article Mustard
Black mustard (Brassica nigra). (Photo courtesy of Jennifer Anderson, USDA–NRCS PLANTS Database)
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from article Forensic botany
Surface of a green bean pod, showing its spines using (a) light microscope (courtesy of David O. Norris) and (b) scanning electron microscope (courtesy of Meredith Lane).
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from article Exposure meter
Basic exposure meter circuits. (a) Photovoltaic type circuit. (b) Photoconductive type circuit.
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from article Anthropology
Fossil skulls of four different species of Homo (clockwise from upper left): Homo neanderthalensis, Homo antecessor, Homo erectus, and Homo sapiens. Each skull shows different anatomical variations. (Credit: creativemarc/Shutterstock)
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from article Anthropology
The indigenous inhabitants of Siberut Island (West Sumatra, Indonesia) are known as the Mentawai people. They live a seminomadic hunter-gatherer life in the coastal and rainforest environments of the island. (Credit: Chanwit Whanset/Shutterstock)
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from article Donor atom
Pentavalent donor atom, phosphorus (P), in the elemental semiconductor silicon (Si). (a) Phosphorus atom in a substitutional position, that is, replacing silicon, a tetravalent host atom, by completing the four tetrahedral covalent bonds with its…
