How have DNA, ATP and protein replaced RNA in more complex biological systems

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.

Most enzyme names end in the

In which ways are mercury and venus similar?