1.	Overexploitation is defined as: Preservation of a species' natural habitat The wiping out of so many individuals that the population can't maintain itself Pollution of a species' natural habitat Putting endangered species on display in zoos
2.	What is the greatest environmental challenge of endangered species? the quality of water the quality of air the availability of food the deterioration of the environment in general
3.	What is economic extinction? When a species has disappeared for more than 100 years When it is no longer profitable to harvest a species When the products made from a species are no longer wanted in the market When the products made from a species are confiscated by police
4.	The rhinoceros is mainly hunted for its: tough skin thick toenails horn eyes
5.	The elephant is highly prized mainly for its: ears meat skull tusks
6.	Which of the following rivers is not polluted? Rhine River Yangtze River Danube River Lake Baikal None of the above All of the above
7.	Birds of paradise are killed mainly for their: impressive crowns beaks claws feathers
8.	Which of the following is not an indirect cause of extinction? agricultural development hunting pollution mining
9.	What is the main reason that mining has negative effects on the environment? taking resources from the earth is bad many of its wastes contain toxic substances cave-ins are dangerous to workers digging holes in the earth weakens soil structure
10.	What is the only reason for extinction? habitat loss pollution commercial exploitation natural causes ignorance human activity there is no single cause for an organism's extinction