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The cell membrane forms a protective barrier between the external and internal environments. It is referred to as ___________________, because it allows some substances to cross more easily than others
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The cell membrane forms a protective barrier between the external and internal environments. It is referred to as ___________________, because it allows some substances to cross more easily than others and blocks other substances from crossing into the cell.

User Herr Derb
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Answer: selectively permeable

Step-by-step explanation:

User Yoshiyahu
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The cell membrane is semipermeable. 
User Simon Ernst
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