The cell membrane is a structure that separates the cell from its environment.

Identify an object or molecule that cannot pass through the cell membrane.

Explain why preventing the free passage of this object or molecule helps the cell.

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What is the similarities and differences between bacteria and eukaryote?

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Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.