It Is Clear That a Heavy Dose of Pesticides or Other

question 57

Multiple Choice

It is clear that a heavy dose of pesticides or other toxic pollutants can kill species. However, chronic exposure to pollutants seems to cause recent high mortality in marine mammals by

• A) Decreasing the plants that are normally in their environment, such as kelp, that they use for shelter
• B) Killing off the prey species that they depend on for food
• C) Direct bioaccumulation of the chemicals, such as lead, in their tissues
• D) Causing weakened immune systems and increased vulnerability to infection
• E) Eventually killing them

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