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  • Stage 1

    Answer 5 out of 7 questions correctly.

Like all living things, cells need to maintain
homeostasis,
or a state of internal stability. To do this, cells must be able to bring in essential molecules and expel waste products. These molecules move in and out of the cell by crossing the cell membrane.
Some molecules can cross the cell membrane without using cellular energy. This movement is called passive
transport.
Other molecules need to use energy from the cell to move across the membrane. This movement is called active
transport.
Select the true statements.
ref_doc_title.

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