membrane transport?

Nov 26, 2019
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Note: I've looked this question up to find the answer (hope this helps). Link below:

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Mar 4, 2020
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Higher lifeforms have specialize ports(openings) for the consumption of nutrients and oxygen. And ports for waste products and CO2. A cell only has a skin.(membrane) Microscopic ports are all over this skin. The little ports have shape and size and electric potential for the media that crosses the ports. It's very selective, like keys and locks.
 
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