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. Causing weakened immune systems and increased vulnerability to infection
B. Direct bioaccumulation of the chemicals, such as lead, in their tissues
C. Killing off the prey species that they depend on for food
D. Eventually killing them
E. Decreasing the plants that are normally in their environment, such as kelp, that they use for shelter
Answer: A
You might also like to view...
The third law of thermodynamics tells us that no substance can
A. reach the bottom of the kelvin scale of temperature. B. ever stop radiating energy. C. both of these D. neither of these
Which of these numbers represents the lower limit, or lower estimate,
of sea-level rise? What will be an ideal response?
Which of the following carbohydrates is associated with crustacean shells?
A) cellulose B) chitin C) glucose D) glycogen
Which of the following is considered the world's largest accidental oil spill?
A) Blowout of the Ixtoc #1 oil-drilling platform in 1979. B) Explosion of the Deepwater Horizon oil-drilling platform in 2010. C) Intentional dumping by the Iraqi army in 1991. D) Rupturing of the Exxon Valdez supertanker in 1989. E) Spillage from natural seeps and regular human activities every year.