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As water flows downhill, its energy can be used to generate electricity. Later, this water may evaporate, fall as rain, and be used again to generate electricity in the same way. This explains why electricity generated with water is considered*
The fast food industry in the United States buys many russet potatoes from farmers. Therefore, most potato farmers grow russet potatoes. If farmers continue to plant the same crop in the same fields year after year without putting additives into the soil, the end result could be*
Many scientists are worried about some of Earth’s finite resources because humans are*
Many beverage companies are required to recycle bottles and cans because this activity directly reduces*
Nonrenewable resources are*
According to scientists, ocean waves could be a source of energy. Devices are being designed to capture the energy from waves and supply electricity to coastal areas. A direct benefit of utilizing this technology to produce energy would be the*
Which graph best shows the changes in global human population and natural resource use over the past 500 years?
The burning of fossil fuels has harmed the environment by*
New York State charges consumers a fee when purchasing beverages sold in aluminum cans and plastic bottles. This money is returned to purchasers when they return these items for recycling. Programs such as these are an attempt to*
Humans deplete the most resources when*
The finite resources of Earth are often affected by increasing human consumption. These finite resources are*
Base your answer to question 12-15 on the information and graph below and on your knowledge of biology.
At an observatory in Mauna Loa, Hawaii, scientists have been measuring and collecting data related to changes in the atmosphere since the 1950s. The remote location of the observatory makes it ideal for studying atmospheric conditions that can cause climate change. One specific measurement taken is the amount of atmospheric carbon dioxide. Information for a 7-year period is shown in the graph below.
Analyze the data shown in the graph. In your answer, be sure to:
• state the overall relationship between time and carbon dioxide levels 
• state one possible cause for the overall change in the carbon dioxide levels shown in the graph 
• identify the biological process that might account for the decreases in carbon dioxide levels 
• identify two actions carried out by humans that could lower carbon dioxide levels *
State why fossil fuels are considered a finite resource. *
Base your answers to questions 17 on the information below and on your knowledge of biology.
Decline in the Amphibians
Declines in amphibian species, such as frogs, toads and salamanders, might affect the ways in which ecosystems function. Amphibians prey on many types of small organisms that survive by consuming leaf litter (leaf material on the ground of ecosystems). These small organisms include animals such as earthworms, centipedes, millipedes, pill bugs, and many species of insects. In turn, amphibians are preyed on by fish, herons, chipmunks, turkeys, foxes, coyotes, and other animals.
Human activities often cause a reduction in the size of amphibian populations. As amphibian populations are reduced, the organisms that are preyed on by amphibians increase in number. As the populations of small forest organisms increase, the amount of leaf litter decreases. The decrease in the amount of leaf litter on the forest floor may have negative effects on the forest ecosystem.
Identify one human activity and describe how that activity could directly or indirectly lead to a reduction in amphibian populations. *
Base your answers to questions 18 on the information below and on your knowledge of biology.
Mosquito Technologies of New York, Inc., has developed a Mosquito Killing System (MKS) to help control the mosquito population and reduce the transmission of West Nile Virus. The MKS works by taking advantage of the natural hunting strategies of mosquitoes, such as heat sensing and carbon dioxide detection. Beneficial insects do not use the same hunting strategies. The MKS unit produces heat and releases carbon dioxide in cycles, mimicking the breathing and body temperatures of humans, pets, and other warm-blooded animals. This attracts the mosquitoes to the device and, once inside, a vacuum pulls them in, where they pass through an electrocution grid, killing them. The mosquito remains are then returned to the environment through the bottom of the unit.
The unit contains a solar-powered photocell that turns the device on at dusk and turns it off at dawn.
State one positive effect the use of this MKS device has on the environment. *