Question

researchers have long hypothesized that woolly mammoths were hunted to extinction in north america by humans using spears with grooved tips known as clovis points. one anthropologist set out to test this hypothesis. using a mechanical spear - thrower, he launched spears with clovis points into mounds of clay - substitutes for the animals large bodies. projectiles generally penetrated only a few inches into the clay; an amount insufficient to have harmed most woolly mammoths. this led the anthropologist to conclude that hunters using spears with clovis points likely werent the principal drivers of the extinction.
6 mark for review
which choice best states the main purpose of the text?
a to argue for the significance of new findings and an ongoing debate among researchers.
b to discuss the advantages and disadvantages of the method used in an experiment.
c to summarize two competing hypotheses and a major finding associated with each one.
d to describe an experiment whose results cast doubt on an established hypothesis.

Explanation:

The text describes an experiment where a mechanical - spear thrower was used to test the hypothesis that humans using Clovis - point spears hunted woolly mammoths to extinction. The results of the experiment cast doubt on this established hypothesis.

Answer:

D. To describe an experiment whose results cast doubt on an established hypothesis