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Chapter 4: Cell Functions

Difficulty Level: At Grade Created by: CK-12
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This window screen has a fly on it. In a way, the window screen is like a cell membrane. It lets some things pass through while keeping other things out. Air molecules and raindrops can pass through the screen, but larger objects like the fly cannot. In the first lesson of this chapter, you'll learn about different ways that substances can pass through the cell membrane. You'll find out how the cell membrane lets some substances pass through while keeping other substances out.

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Grades:
7 , 8
Date Created:
Oct 24, 2013
Last Modified:
Aug 02, 2016
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