Vervet monkeys use vocal alarm calls to warn each other about the presence of predators.

Millipedes may be characterized as ( ). A: active predators B: venomous C: scavengers and detritivores D: monoecious E: viviparous

“The huge, unpredictable apes” (Para. 7) refer to ______. A: cats’ predators B: cat owners C: visiting guests of the house

Unit3-Thishelpedtoconvincemany ——of thecaseforrestoringthe building to its former condition.Times, Sunday Times(2009) A: sceptics B: predators C: doubts D: sceptic

29. According to the professor, why were the<br/>jellyfish that the student saw glowing? A: They were communicating with each other. B: They were trying to confuse predators with<br/>bright flashes of light. C: They were avoiding predators by blending in<br/>with their surrounding. D: They were trying to light up the dark water<br/>so they could see prey.

According to the passage, why do many fishes stay in group ？（） A: It helps improve their safety. B: It allows them to swim faster. C: It helps them fight their predators. D: It allows them to avoid twists and turns.

What can we learn about Lake Natron? A: It is simply uninhabitable for most animals. B: It remains little known to the outside world. C: It is a breeding ground for a variety of birds. D: It makes an ideal habitat for lots of predators.

In the jungle, there is usually little time to （） A: recognize where a threat has come from B: compare the benefits of different actions C: weigh merits and demerits of game theory D: escape attacks from powerful predators

The difference between food webs and food chains is that food webs: A: Consist of only one trophic level B: Include primary producers as well as consumers C: Do not take into account predators D: Are more complex

What does the professor mean when she says this: A: Reproduction is the goal of the salmon’s run. B: Salmon can swim very fast to escape predators. C: Future generations of salmon will face habitat loss. D: Salmon migrate great distances in search of food.