Which are biomolecules that mainly serve to provide and store energy for the body

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.

There are only about 250,000 known fossil species. true or false

What term describes a doctor who becomes a specialist by meeting standards beyond those of getting a license and passing a test in the specialty area?