A membrane that allows some molecules to pass through but not others is called a(n)

has a selection function so it selects the substances which to enter or not inside the cell

the "power" of a lens is its resolution power, or its ability to distinguish between to closely located points. with the low power lens, it is likely you will see the rough form of the hay and maybe some movement of dots around the hay. however, when observed with the high power lens, the detailed features of the hay become visible and the microbes being grown are more clearly visible.

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