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View Resource An African elephant (Loxodonta africana) in a savannah ecosystem within Kruger National Park, South Africa.

African elephants (Loxodonta Africana) have an important impact on that ecosystem type, influencing its structure, function, and composition. In Kruger National Park, South Africa, park scientists,...

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View Resource A field planted with two kinds of cotton (Gossypium sp): Bt cotton and normal cotton, where the normal cotton acts as a refuge for insects.

Some rows of the field in the photograph contain cotton plants (Gossypium sp) that are genetically engineered to produce a toxin from the bacterium Bacillus thuringiensis (Bt). Bt kills insects that...

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View Resource A community of wildflowers growing in a restored prairie in southwestern Wisconsin.

A community of wildflowers growing in a restored prairie in southwestern Wisconsin. The community pictured was open to foraging by meadow voles (Microtus pennsylvanicus), resulting in vegetation...

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View Resource Two male Hawaiian monk seals (Monachus schauinslandi), one of which has been temporarily marked for a mark-recapture study.

Two male Hawaiian monk seals (Monachus schauinslandi) at French Frigate Shoals in the northwestern Hawaiian Islands. Monk seals are the only true seals found year-round in tropical waters. They are...

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View Resource Aerial view of the upper Willamette River, Oregon.

Aerial view of the upper Willamette River, Oregon. Although some off-channel features and riparian forest remain, particularly in upper reaches as illustrated here, overall the Willamette River has...

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