Which of the following best describes the primary function of highlight text?

Which of the following, if true, most strengthens the author's assertion in the first sentence of the second paragraph?

The passage suggests that which of the following is partially responsible for the difficulty in establishing the precise date when the fur trade in North America began?

The author of the passage draws conclusions about the fur trade in North America from all of the following sources EXCEPT

The author implies which of the following about the ability of the researchers mentioned in the highlighted text to predict earthquakes?

The passage suggests which of the following about the paleoseismologists' findings described in highlight text?

According to the passage, some researchers based their research about long-term earthquake prediction on which of the following facts?

It can be inferred from the passage that one problem with using precursory phenomena to predict earthquakes is that minor tremors

According to the passage, laboratory evidence concerning the effects of stress on rocks might help account for

The passage is primarily concerned with