Which statement best describes the role of the cell membrane?
a) it stores genetic material.
b) it breaks down food particles.
c) it encloses the cytoplasm.
d) it produces proteins.

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The double bond between a carbon atom and two oxygen atoms (a molecule of carbon dioxide) has two characteristics. what are they? a.an ionic bond is formed between the oxygen and carbon atoms. b.four valence electrons are shared. c.two valence electrons are shared. d.valence electrons are shared between oxygen atoms.

Which of the following do all living things have in common