Carbon-dioxide traps______ in the atmosphere and increases global warming.

The phrase “For starters” in paragraph 2 could best be replaced by “______”.

The author beliveves that rote rotation is ________.

Broasides could be published with little risk to colonial printers because they ________.

The word "it" in paragraph 3 refers to ________.

Why does the author mention Joseph Pulitzer and William Randolph Hearst?

All of the following are mentioned as places in which memories are stored EXCEPT the ________.

Why does the author mentions a dog’s bark?

The word “it” in paragraph 3 refers to ________.

Which of the following is NOT supported by the passage?

The word “cues” in paragraph 4 is closest in meaning to ________.

Which of the following is NOT well understood by biologists?

The word “elaborate” in paragraph 3 is closest in meaning to ________.

The word “it” in paragraph 2 refers to ______.

The word “exceed” in paragraph 3 is closest in meaning to ______.

The idea “little is known about the evenness of butterfly distribution” in paragraph 5 is that ______.