brooklynperry56
brooklynperry56 brooklynperry56
  • 04-03-2018
  • Biology
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a substance that moves across a cell membrane without using the cells energy tends to move?

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michellejiang9p51b45
michellejiang9p51b45 michellejiang9p51b45
  • 04-03-2018
It's morem concentrated
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