How can a biologist use the information in molecular clocks

A. Can examine the time that two or more species are evolving independently of each other

B. Determine the amount of time the Fossils have been buried in the earth

C. Can determine about the time the organisms went extinct

D. Can examine what kind of point mutations that randomly Occur within the DNA sequence

thymine. in rna, thymine is replace by uracil

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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

d. organisms have cells with different shapes and functions.