The day the Mesozoic died Why are the scientists certain they know what happened on that day?

pregnancy happens more and more

a

explanation:

answer; the above statement is (true);

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