What are natural resources?

Which situation is an example of nonnative species introduction?

• A huge volcanic eruption in Washington destroyed many habitats
• A large oil spill in the Gulf of Mexico killed many organisms that lived there.
• Horseshoe crabs in the waters of Virginia have been overfished, and their numbers have declined
• Water hyacinths from Asia now grow in the United States and are crowding out animals and other plants.

A lake is drained and filled in order to make room for a new housing development. This is an example of

• eutrophication
• habitat destruction
• nonnative species introduction
• deforestation

Human-induced environmental changes can affect living things at which level(s)?

• organisms only
• organisms and populations only
• species only
• organisms, populations, and species

Which statement best explains how deforestation affects organisms?

• It increases the amount of carbon dioxide in the air, enhancing global warming
• It reduces the amount of carbon dioxide in the air, enhancing global warming
• It reduces the amount of carbon dioxide in the air, enhancing ozone layer destruction
• It increases the amount of carbon dioxide in the air, enhancing ozone layer destruction

Which statements describe global warming? 

• Global warming can be decreased through deforestation.
• Global warming results from the buildup of nutrients in runoff
• Global warming is likely increased by humans
• Global warming is enhanced by nonnative species

Which of the following are effects of environmental change on an entire species?

• individual deaths and impacts on growth and development
• impacts on growth and development and losses of habitats
• species competition and individual deaths
• extinction and change in species competitio

The image illustrates a human-induced environmental change.

• pollution
• wildlife hazard
• eutrophication
• non-sustainable harvesting

Which human-induced change results in increased competition caused by an initial increase in the number of organisms in a habitat?

• non-sustainable harvesting
• nonnative species introduction
• ozone layer depletion
• mass extinction

Which chemical is a major contributor to ozone layer destruction? 

• Chlorine
• Nitrogen
• Phosphorous
• Methane

Which situation is an example of a human-induced environmental change affecting a population?

• Blue jays no longer live in a forest because the trees in the forest were cut down.
• A volcanic eruption killed grasses that were growing within a few miles of the volcano.
• Floods from a storm forced many white-tailed deer to move to a new habitat.
• A fisher caught a few different species of fish that live in an ocean habitat.