Answers26.3611055 ECSD Environmental Science FICUnit Test

Unit Test — Cumulative exam Answers

23 verified answers
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Mammals were not contemporaries of the dinosaurs.

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Freshwater biomes have _______.a.organisms adjusted to high salinityb.more diversity than marine biomesc.a salinity of less than 1%d.the ability to maintain their temperature year round

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Which of the following is not a source of air pollution related to human activities?a.gasolineb.garbagec.forest firesd.radon

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Which of the following statements about air pollution is not true? a. Air pollution is caused by natural and human processes. b. Carbon monoxide and sulfur oxides are common air pollutants. c. Natural components of air, like carbon dioxide, cannot be considered air pollutants. d. Primary and secondary pollutants are harmful to human health and the environment. Please select the best answer from the choices provided

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Alternative energy sources are always dependent upon favorable weather conditions.

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Yellowstone National Park has 124 wolves living in it. The park covers 3472 square miles. What is the population density of wolves living in Yellowstone?a.28 wolves/mib.0.0357 wolves/mic.82 wolves/mid. 43 wolves/mi

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Which of the following is not a method to determine population size?a.mark/recaptureb.samplingc.hypothesisd.observation

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Why do many fishermen support efforts to protect and restore mangrove forests?a.Most fishermen are environmentalists.b.Many fish breed in mangrove forests.c.They lay their nets in mangrove forests.d.Mangrove forests provide valuable hardwoods.

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The greenhouse effect _______.a.is essential for life on Earthb.warms Earth’s atmospherec.is a natural phenomenond.all of the above

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Which of the following is considered an arid biome?a.grasslandb.desertc.savannad.rainforest

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Which of the following best explains why air pollution that was once blamed for global cooling is now considered responsible for global warming?a.Pollution began reflecting sunlight and heat rather than absorbing it.b.Evidence of global warming became overwhelming.c.Scientists mistakenly thought pollution reflected sunlight and heat rather than absorbed it.d.Congress required scientists to assign a cause to global climate change.

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Fish rely on coral for _______.a.shelterb.food supplyc.camouflaged.all of the above

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Which of the following species is an R-selected species?a.Giant tortoisesb.Mosquitoesc.Elephantsd.Redwoods

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Which of the following statements about the phosphorus cycle is true?a.In living organisms, phosphorus can be found in nucleic acids.b.Phosphorus in aquatic ecosystems is only found in sediment.c.Elevated levels of phosphorus in aquatic ecosystems is always beneficial. d.The soil plays no part in the phosphorus cycle.

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What organism is the main producer in freshwater ecosystems?a.phytoplanktonb.zooplanktonc.anaerobic bacteriad.none of the above

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Which of the following statements about biodiversity is not true?a.Changes to biodiversity never occur naturally.b.Changes to biodiversity can lead to a decrease in ecosystem stability.c.Changes to biodiversity can positively and negatively affect on an ecosystem.d.Changes to biodiversity can lead to an increase in ecosystem stability.

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The widespread loss of wetlands would have little effect on the overall health of the environment.

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Which of the following about abiotic factors in ecosystems is true?a.Abiotic factors in healthy ecosystems are not in balance.b.Abiotic factors are located in the soil of ecosystems only.c.Abiotic factors are part of a dynamic system.d.Abiotic factors in ecosystems are used up by the living components.

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Global climate change will have no impact to life on the Earth.

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The ozone layer helps sustain life by absorbing a large amount of incoming UV radiation.

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