What happens when the activation energy of a reaction is lowered:
a. enzyme is consumed
b. â–³g remains constantly changes
c. the amount of energy in the products and reactants change
d. none of the above

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.

Sequence how oxygen accumulated in the atmosphere and the effect it had on life by completing the flowchart

List the substances normally stored in bone tissue