Why is resistance to pesticides likely to occur over time when they are used in agriculture?
What will be an ideal response?
A small fraction of large pest populations may have genes that confer some degree of immunity to a given pesticide. If very few resistant pests survive, they may reproduce quickly and create a new population of genetically resistant pests because their population is no longer balanced by the susceptible individuals. The pesticide will not be effective against this new resistant pest population.
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Most members of the underclass quickly rise in economic status
Indicate whether this statement is true or false.
Only about 30 species have recovered significantly enough to be removed from the Endangered Species List. Recovery to this extent is limited because
A) the regulations protecting the species do not extend to private landowners. B) hunting of protected species often continues even after the organisms are listed. C) populations are already low and at high risk by the time they are listed. D) protecting the habitat of an endangered species is not as critical as once assumed.
The ozone layer, a part of the stratosphere, is important to organisms on Earth's surface because it absorbs large amounts of the sun's ultraviolet radiation
Indicate whether the statement is true or false
Which of the following greenhouse gases is produced by leakage from landfills, by domestic cattle, and by the cultivation of rice?
A) Carbon dioxide (CO2) B) Chlorofluorocarbons (CFCs) C) Methane (CH4) D) Nitrous oxide (N2O) E) Water vapor