The passage suggests which of the following about the workers who took temporary jobs during the 1980s?

The passage suggests which of the following about the use of temporary employment by firms during the 1980s?

According to the passage, which of the following is true of the "factors affecting employers" that are mentioned in the highlighted text?

The primary purpose of the passage is to

It can be inferred from the passage that while inside its polyhedrin protein crystals, the nuclear polyhedrosis virus

According to the passage, nuclear polyhedrosis viruses can remain virulent in the environment only when

According to the passage, before the discovery of new techniques for detecting viral DNA, population ecologists believed that viral diseases

Which of the following, if true, would most weaken the author's conclusion in the highlighted text?

It can be inferred from the passage that the mortality caused by agents such as predatory birds or parasites was measured in an attempt to

The primary purpose of the passage is to