Plants need bacteria in order to take up and use which element?
carbon
oxygen
nitrogen
hydrogen

Name the organs of humanelemintary canal.

What amino acid is coded for by this sequence after the mutation

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.