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Asubstance that moves across a cell membrane without using the cells energy tends to move
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The part of the eye that closes and opens to let light in is .
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Which of the following is true about the introduction of a non-native species to an environment? (a) they usually adapt quickly so they can have a positive affect on the environment. (b) they can disrupt the environment and cause much damage and devastation to native species. (c) they usually become predators in a food chain and to keep prey populations under control. (d) because the native species are better-adapted to the environment, the non-native species always end up dying out.
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Asubstance that moves across a cell membrane without using the cells energy tends to move...
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