Give an example of how an invasive species can cause ecological or economic harm
What will be an ideal response?
Lacking predators, parasites, and/or competitors in their new environment, invasive species can proliferate and dominate a community. Impacts of invasive species have become more extensive in recent years because of the increased mobility of humans and globalization. An example of an invasive species is the zebra mussel, which was likely transported from Europe in the ballast water of ships. It is now spreading throughout waterways in the United States. The mussels clog the intake pipes of power plants, water treatment facilities, and even boat engines, requiring expensive monitoring and removal activities.
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Although hydroelectric dams generate electricity without directly producing greenhouse gases, they ________
A) eliminate wildlife habitats and affect the temperature of waterways B) produce as much other air pollutants as coal-fired power plants C) are short-lived structures that have to be rebuilt about every 20 years D) contribute only about 5% of global electricity production
Which of these features form because, at high altitude, air pressure differences above cold and warm air regions cause air to move from warm regions towards cold ones?
a. El Niño b. Azores high c. jet streams d. polar easterlies e. gyres
Which of the following has helped to reduce pressure on wild fish stocks?
a. Concentrated animal feeding operations b. Sustainable agriculture c. Aquaculture d. Monocultures
It is possible to totally convert a given amount of mechanical energy into heat
A) True B) False