i need some help in these questions to finish for a test plz help to answer some questions?

The arrival of Europeans in the Hawaiian Islands changed the islands by introducing

a. new crops. c. pigs and rats.

b. new ways of farming. d. all of the above

Early hunters and gatherers in North America are responsible for

a. natural plant and animal populations.

b. a major extinction event of large animals.

c. producing new varieties of crops.

d. inventing technology such as manufactured tools.

A resource, such as air or parts of the oceans, that is open to anyone is often preserved and protected by

a. national organizations. c. the country near which it is located.

b. everyone. d. no one.

An example of a sustainable-use practice is the use of beneficial insects like ladybugs to

a. harm natural resources. c. control unwanted pests.

b. pollinate plants. d. eat unwanted plants.

One property that makes DDT hazardous over time is that DDT is

a. an insecticide. c. nonbiodegradable.

b. a perfect pesticide. d. deadly to herbivores.

A B C D 10.

All of the following are threats to biodiversity EXCEPT

a. biological magnification of toxic compounds.

b. habitat fragmentation.

c. invasive species.

d. species preservation.

A B C D 11.

As DDT moves up the trophic levels in food chains, its concentration

a. stays the same. c. increases.

b. decreases. d. is eliminated.

A B C D 12.

The goals of conservation biology include all of the following EXCEPT

a. wise management of natural resources.

b. protection and management of individual species.

c. preservation of habitats and wildlife.

d. introducing foreign species into new environments.

A B C D 13.

Protecting ecosystem diversity is a goal of

a. the green revolution. c. the captive breeding program.

b. conservation biology. d. the United Nations.

A B C D 14.

Some scientists think that global warming is

a. a natural variation in climate. c. melting the polar ice caps.

b. a result of human activity. d. all of the above

A B C D 15.

The major cause of ozone depletion is

a. nitric acid. c. chlorofluorocarbons.

b. sulfuric acid. d. ultraviolet light.

A B C D 16.

In the very distant past, most people

a. lived in small groups. c. did not gather plants.

b. lived in permanent settlements. d. did not hunt animals.

A B C D 17.

Imported plants in Hawaii have

a. crowded out many native species. c. introduced diseases.

b. reduced the native bird species. d. depleted natural resources.

A B C D 18.

Land is a resource that provides

a. space for cities and suburbs. c. soil for growing crops.

b. raw materials for industry. d. all of the above

A B C D 19.

An old-growth forest is

a. a renewable resource. c. a microclimate.

b. a nonrenewable resource. d. poor in biodiversity.

A B C D 20.

The wearing away of surface soil by water and wind is known as

a. deforestation. c. overgrazing.

b. desertification. d. soil erosion.

A B C D 21.

Farmers can reduce soil erosion by

a. increasing irrigation. c. grazing cattle on the land.

b. contour plowing. d. plowing up roots.

A B C D 22.

Using renewable resources while ensuring that they are not depleted is a practice called

a. sustainable development. c. biological magnification.

b. monoculture. d. subsistence hunting.

A B C D 23.

Biodiversity is important to human society because it

a. is a natural resource. c. provides medicines.

b. provides food and goods. d. all of the above

A B C D 24.

The sum total of the genetically based variety of living organisms in the biosphere is called

a. species diversity. c. biodiversity.

b. sustainable use. d. conservation biology.

A B C D 25.

An endangered species is

a. a diseased animal.

b. a dangerous predator.

c. a group of organisms near extinction.

d. all organisms at the top of a food chain.

A B C D 26.

DDT was used to

a. fertilize soil. c. form ozone.

b. kill insects. d. feed animals.

A B C D 27.

One of the goals of conservation biology is to

a. enforce environmental laws. c. manage natural resources.

b. protect habitats. d. all of the above

A B C D 28.

An ecological “hot spot” is an area where

a. habitats and species are healthy.

b. hunting is encouraged.

c. habitats and species are in the most danger of extinction.

d. species diversity is too high.

A B C D 29.

Overexposure to UV radiation can

a. cause cancer.

b. decrease organisms’ resistance to disease.

c. damage eyes.

d. all of the above

A B C D 30.

An increase in Earth’s average temperature from the buildup of carbon dioxide and other gases in the atmosphere is called

a. the greenhouse effect. c. global warming.

b. ozone depletion. d. particulate dispersal.

Completion

Complete each statement.

1.

To prevent certain fish populations from collapsing, cert

3 Answers

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  • Anonymous
    10 years ago
    Favorite Answer

    Funny, you said in another category, you were taking an online test. You are abusing this resource. Your parents must be really proud of you.

    http://answers.yahoo.com/question/index?qid=201006...

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  • Donna
    Lv 4
    4 years ago

    Yea, you got herpes bro. lol, I'm just messing with you. You went to the docs, got checked out, nothing is wrong with you, dude. Stop worrying so much. If it will make you more comfortable then go get tested again. It will come back negative just like the other tests but you will probably still be paranoid and keep thinking you have it. The only way to get over it is to stop thinking so much and realize you're fine.

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  • Ridha
    Lv 4
    10 years ago

    ...??....

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