Unit Test — Unit test Answers

Which sustainable practice is paired correctly with its impact on the environment?

What is the difference between food chains and food webs?

Wolves are predators of deer. What is most likely to happen to the deer population if the wolf population increased?

Rainforests around the world are being cleared at an alarming rate to make room for new communities, agriculture, mining, and roads, and to provide lumber for construction and furniture. How might the destruction of rainforests affect the balance of gases in Earth's atmosphere?

Review the chart, which shows the population sizes of three African animals in 1990 and in 2000. Population Estimates of Animals in Africa in 1990 and in 2000 19902000Lions100,00047,000Cheetahs25,0007,500Zebras750,000450,000Which explanation is best supported by the numbers in the chart?

What would happen to the size of the carnivore population if the herbivore population increased?

White perch is a fish that is native to Atlantic coastal regions and is invasive to the Great Lakes. It feeds on native species and is thought to be the cause of the decline of the Great Lakes walleye fish populations. What was most likely its mode of introduction?

Which organism obtains its energy exclusively from dead or decaying matter?

A grass starts with 30,000 kJ of energy. How much energy would a cheetah acquire after it ate a zebra that consumed the grass?

Which human activity is correctly paired with the greenhouse gas that it increases?

The map shows the distribution of wild boars in the United States (shaded area). Which of these facts about wild boars is best supported by the evidence provided?

Which water source may become polluted as it travels over land?

Which organism is an example of a producer?

Which process do plants use to turn sunlight into food energy?

From the producer level to which level does energy flow directly?

Which of the following substitutions can help reduce air pollution?

Freshwater can be renewed, but environmentalists consider it nonrenewable. Why is there a contradiction in classification?

A relationship in which one species kills and consumes another species is known as

Which is an interconnection of food chains in an ecosystem?

The cane toad, or Rhinella marina, was introduced to the Hawaiian Islands in 1932 by sugar cane farmers. The farmers released the toads in their crops to help control pests that were damaging the sugar cane. The cane toad has few natural predators because it secretes a poisonous toxin that kills the animals that consume it. As a result, the cane toad population thrived, and by 1935, it numbered hundreds of thousands. Which role does the cane toad play in the Hawaiian Islands?