The passage suggests that Clayton's experiment demonstrated scrub jays' ability to
According to the passage, Clayton's experiment depended on the fact that scrub jays
The primary purpose of the passage is to
Which of the following is mentioned in the passage as an argument made by scientists who are unconvinced that birds evolved from theropod dinosaurs?
In the context of the passage, the phrase "fossils of a predicted kind" (highlight) most likely refers to which of the following?
According to the passage, which of the following factors distinguishes an indirect purchase from other purchases?
Which of the following can be inferred about supplier partnerships, as they are described in the passage?
Which of the following best describes the relation of the second paragraph to the first?
The author mentions the "aftermath of the Mount Saint Helens eruption" most likely in order to
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