Why are some male fish in the ocean developing female characteristics?

a. Evolution
b. PCBs
c. Estrogen-mimicking compounds
d. Mercury


ANS: C
There are many females that take birth control pills which are excreted through their urine. These
compounds are causing the feminization of fish. Information can be found in the section Marine
Pollutants May Be Natural or Human Generated.

Environmental & Atmospheric Sciences

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At Kyoto in 1997, what did the 30 Western industrialized countries legally agree to do?

A) voluntarily limit greenhouse gas emissions B) finance further studies to determine the cause of climate change C) reduce emissions of greenhouse gases by half D) reduce emissions of greenhouse gases to 1990 levels E) censure China for exceeding its carbon limits

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Explain global warming, its causes, and its consequences

What will be an ideal response?

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A farmer is tired of watching crops die in the field from several pest species. She decides that next year she is going to use every type of ecological pest control she can find to address the problem

Over the winter she gets ready, ordering pheromones that interfere with the reproduction of the pests, sterile male flies that will try to reproduce with some of the pest flies, and wasps that lay their eggs in the larvae of another pest. It is expensive, but she thinks this should work well. Which of the following forms of control is she not using? A) Natural enemies control B) Cultural control C) Genetic control D) Natural chemical control

Environmental & Atmospheric Sciences

How many worldwide earthquakes with a moment magnitude greater than 9 should we expect in any given year?

A. About 5 B. Less than 20 C. About 10 D. Less than 1 E. 1

Environmental & Atmospheric Sciences