Which marine ecosystem is among the most productive and found globally in cold nutrient-rich waters? O Coral reefs
O Intertidal zones
O Kelp forests
O Neritic zones

COME ON PLEAS

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation:

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