In the domain system of classification, prokaryotes are divided into two domains: bacteria and archaea. the two domains differ in all but one feature. that is,
a) have prokaryotic cells
b) have identical cell walls
c) thrive in extreme environments
d) are able to live under anaerobic conditions

a

they are prokaryotes and therefore have prokaryotic cells

a) have prokaryotic cells

Both Archaea and Bacteria domains exhibit prokaryotic cells. These are unicellular organisms. The cells in these organisms lacks a well defined nucleus, membrane bound nucleus and membrane bound organelles.  

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