Not all non-native species are totally terrible! Here are six of them can actually do more good than harm.

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BROWN TREE SNAKE Credit: Pave
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Paul Andersen explains how populations interact in an ecosystem. The symbiosis of several populations is based on effects that may be neutral, positive, or negative. Interactions like mutualism, commensalism and parasitism are...

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Distance learning video about mutualism.

In this live-action program viewers will learn that pollination is a key step in sexual reproduction among all flowering plants and the purpose of pollination is to allow individual plants to exchange genetic information. Students will...