Chemical reactions that release energy
a. will not occur.
b. often occur spontaneously.
c. need catalysts to occur.
d. will always explode.

What must be done to breed dogs for a partical trait

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots

4. if a cell is placed inside a solution that has a higher concentration of solute than on the inside of the cell, what can be said about the movement of water? a. water will move out of the cell, causing it to shrivel. b. water will move in and out of the cell at the same rate. c. water will move out of the cell, causing it to swell. d. water will move into the cell, causing it to swell.