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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 Acanthodii

Jaws of an Early Devonian ischnacanthid from northern Canada. The upper palatoquadrate and lower meckelian cartilages have tooth-bearing jawbones along their facing edges. (From University of Alberta, Laboratory for Vertebrate Paleontology…

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from article Acanthodii

Examples of acanthodians from the Early Devonian of northern Canada. (a) Primitive climatiiform Lupopsyrus. (b) Diplacanthid Tetanopsyrus. (c) Ischnacanthiform Ischnacanthus. (d) Unnamed mesacanthid acanthodiform. (From the University of Alberta,…

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from article Lichens

The ascolichen Teloschistes chrysophthalmus. (Credit: Jason Hollinger)

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from article Lichens

Cuplike lichens of the genus Cladonia. (Credit: Jacinta Lluch Valero)

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from article Dune vegetation

A coastal dune profile.

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from article Dune vegetation

American beachgrass (Ammophila breviligulata), which dominates coastal dunes along much of the Eastern seaboard of the United States and the Great Lakes. (Photo by Rob Routledge, Sault College, Sault Ste. Marie, Ontario, Canada)

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from article Dune vegetation

Sea oats (Uniola paniculata) are abundant on the foredunes of the Atlantic coast of the southeastern United States. (Photo by Robert L. Anderson, USDA Forest Sevice)

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from article Dune vegetation