Rates of sickle-cell disease and malaria are related because
a. they are genetic diseases, and people tend to carry both traits.
b. they are environmentally caused, and people in the same areas are likely to catch both.
c. sickle-cell disease carries a bacteria that causes malaria.
d. sickle-cell traits offer an immunity to malaria.
e. the medication that best treats malaria is deadly to those who have sickle-cell disease.
Which of the following offers the least threat to the ecological integrity of the Amazon?
a. gold mining
b. rubber tapping
c. dams
d. cattle ranching
e. soybean farming
Brazilian rubber tappers
a. lost their livelihoods when synthetic rubber was produced.
b. have become environmentally active to protect the Amazon.
c. plant two new trees for every one they kill by tapping it for rubber.
d. have become the greatest force against indigenous rights in the Amazon.
e. advocate clear cutting to enable new rubber trees to grow without competition.
The human carrying capacity of an area
a. changes when culture and technology change.
b. tends to remain constant through time.
c. is calculated by the yearly death rate in that area.
d. is not dependent on the plants and animals of the area, only the climate.
e. decreases when people migrate out of the region.
The Tragedy of the Commons occurs because
a. there are so few commons left in the world.
b. the ocean, our largest commons, is increasingly owned by individual states.
c. people tend to overuse a commons.
d. people protect the commons, and this leads to the overuse of private areas.
e. too much attention is being paid to commons rather than more important issues.
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