Mr. Jones tells his students that energy cannot be created; it must be captured from the environment. He is talking about the .

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms