Humans in the Biosphere

Early hunters and gatherers in North America are responsible for

• natural plant and animal populations.

• a major extinction event of large animals.

• producing new varieties of crops.

• inventing technology such as manufactured tools.

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

• Ranching

• Predators

• Disease

• All of the above

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

• international organizations.

• everyone.

• the country in which it is located.

• no one.

Which is a way to limit deforestation?

• use more wood products

• plant and harvest trees on tree farms

• increase carbon dioxide levels

• fertilize the soil

The sulfur and nitrogen compounds in smog combine with water to form

• ozone.

• ammonia.

• acid rain.

• chloroflurocarbons.

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

• harm natural resources

• pollinate plants

• control unwanted pests

• eat/destroy unwanted plants

The number of different species in the biosphere is called

• biodiversity

• ecosystem diversity

• genetic diversity

• species diversity

Biodiversity is valuable in the biosphere because it

• gives us interesting things to look at.

• tells us about many other species.

• is the biological life-support system of our planet.

• provides humans with resistance to disease.

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

• an insecticide.

• a perfect pesticide.

• nonbiodegradable.

• deadly to herbivores.

All of the following are threats to biodiversity EXCEPT

• biological magnification of toxic compounds.

• habitat fragmentation.

• invasive species.

• species preservation.