Please help me. how many in total reactants atoms are in n2+3h2-->2NH3

the answer would be..

b. sucking

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

answer; microsoft;