Muscles need a stimulus from which to of the following to "tell" them contract? a. a muscle call b. the skeleton c. a nerve cell d. none of the above

Fission of uranium-235 products energy and a. isotopes of smaller elements b. isotopes of larger elements c. lighter isotopes of uranium d. heavier isotopes of uranium

What are the similarities of physical and chemical change ?

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al oxidizing agent = reducing agent =