which statements about the modification of chromatin structure in eukaryotes are true? select all that apply.

heat a spark and oxygen

every el niño cycle is different. every year.

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