ENVS 1126 : Exam 2 Study Guide
Document Summary
The population recovers and even explodes: silent spring documented the effects of the uncontrolled use of insecticides in the us, malaria example of how pests, such as mosquitoes, can spread diseases. Malaria is an example of a parasite that needs both humans and mosquitoes to propagate itself. In turn, the complex lifecycle of the disease makes it more difficult to crush the parasite. Lyme disease: deer, deer ticks an example of a vector that carries the parasites. 2,900,000 people worldwide annually, exposures are more dramatic in less developed countries: while pesticides show benefits, pests tend to develop environmental resistance, and the poisons lose their effectiveness. Roundup, bacillus thuringiensis: acute effects: characterized by sudden and severe exposure and rapid absorption of the substance. Normally, a sing large exposure is involved: chronic effects: characterized by prolonged or repeated exposures over many days, months, or years.
