The author of Passage 1 states that the human body is more like a garbage dump than a watch (lines 8－9) to emphasize that ______.

A.the parts of the human body don't always work together seamlessly to keep us alive and functioning

B.the human body cannot be counted on to work flawlessly, while watches rarely fail

C.scientists can never tell ahead of time which experiments will work and which will not

D.the human body exists in its present state due to a long evolutionary process that began more than 500 million years ago

E.the human body contains many useless renmants left over from the evolutionary process