If using an hour to illustrate the history of the earth, how long have people
been around?

This is a type pf behavior that animals are born with and them to survive

Differentiation of cells changes the nucleic information. true false

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.