Sam does an experiment in his lab. He discovers that the mass of the reactants before his experiment is the same as the mass of the products after his experiment. What did he prove?

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.

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

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.

artificial selection

explanation:

this occur when man select base on their intelligent