Describe how the plasma membrane controls what goes into and comes out of a cell.

Aplant may open end close its stomata to prevent excess water loss and maintain

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.

What does spontaneous generation mean?