Which of the following functions does the urinary system perform?

it removes wastes from the blood.

it balances the amounts of salts and water in the body.

it controls blood volume by removing excess water produced by body cells.

all of these

Which of the following is an example of a tissue on the digestive system a.the stomach b.smooth muscle that lines the stomach c.nerve cells in the stomach d. enzyme molecules in the stomach

Which organelle breaks down sugar molecules that supply energy to the cell ?

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.