The primary purpose of the passage is to

Which of the following, if true, would seriously undermine the validity of the conclusions drawn from the experiment described in the last paragraph of the passage?

According to the passage, the growth of algae was considered a threat to the success of the artificial pond near the Dead Sea because the algae

It can be inferred from the passage that which of the following is true about the salinity and temperatures of the highest and lowest water layers in a typical solar pond?

The primary purpose of the passage is to

The passage is primarily concerned with

Which of the following best describes the function of the third paragraph of the passage?

According to the passage, Aztec women's cloth production enabled Aztec society to do which of the following?

The author of the passage would be most likely to agree with which of the following statements about the documents mentioned in the first sentence of the passage?

The passage suggests which of the following about the blue butterfly mentioned in the highlighted text?