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Ivan
4 years ago
13

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.
Biology
2 answers:
Anvisha [2.4K]4 years ago
7 0
It is cell wall hope this helps :)
anyanavicka [17]4 years ago
4 0
Correct answer is the Cell Wall
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