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Pokegama Bay contains extensive forested wetlands, uplands, clay flats and submerged lands.
Courtesy of NOAA.

Ecosystems are composed of all interacting organisms (biota) along with their physical and chemical environments. Physical aspects of an ecosystem, called abiotic components, include variables related to temperature, sunlight, soil, and other factors.

Companion slide set to the video, "Ecosystems."


Author(s): Joseph G. Marx, PhD
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Somatic Cell Nuclear Transfer (SCNT): Dolly – The First True Clone (1997)



Natural Selection


Natural Selection

Animal Behavior

Hierarchical Classification

Infectious Diseases Throughout History

Processes Driving Divergence

Gene Discovery by Linkage Analysis

Density-dependent and Density-independent Effects on Populations

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