The author explains that the study of chimpanzees stopped in the 1920s and did not start up until the 1960s. Which two sentences from the text show what caused this gap?
A Unfortunately, these early humans were not alive for observation.
B He dispatched a researcher named Henry Nissen to Africa.
C He was slow and backward and spouted strange noises.
D The problem was no one had invented a way to observe chimps in their natural habitat.
E He hid in camouflaged blinds, but the chimps spotted him and scampered off.
The author explains that the study of chimpanzees stopped in the 1920s and did not start up until the 1960s. Which two sentences from the text show what caused this gap?
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The two sentences that show what caused the gap in the study of chimpanzees are:
D The problem was no one had invented a way to observe chimps in their natural habitat.
A Unfortunately, these early humans were not alive for observation.
Explanation: Sentence D indicates that a lack of observational methods prevented research during that time, while sentence A points to a lack of living subjects to study. Both factors contributed to the hiatus in chimpanzee studies from the 1920s to the 1960s. If you have more questions or need further assistance, feel free to ask!