whitch of the following nutrients is primarily used for building and repairing of demaged cells and tissues

Which of the following claims does the author support the least

Are the earth's ocean floor and continents the same age geologically? why or why not?

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.