Human Impact on Ecosystems Review

There are about 7.5 million people in the world today.

• True

• False

The anticipated human population by the year 2050 is about ______.

• 6 billion

• 9 billion

• 12 trillion

What has been the trend in the world’s human population numbers in the last 200 years?

• It has increased at a slow, linear rate.

• It has increased at a large, exponential rate.

• It has maintained a balance due to slowing birth rates.

A measure of the number of people in a given area is called ______.

• average population

• population size

• population density

Suppose you counted 20 Monarch butterflies in a garden measuring 10 m². What would be the population density of the Monarch butterflies?

• 2 butterflies per m²

• 200 butterflies per m²

• 20 butterflies per m²

Which of the following is an alternative to disposing of trash in a landfill?

• Recycling paper, plastic, glass, and other materials.

• Composting leaves, lawn clippings, and old food.

• Incinerating while providing a filter to trap harmful emissions.

• All of the above are alternatives to disposing of trash in a landfill.

Why do landfills have liners?

• To keep toxic chemicals from seeping into groundwater.

• To keep sewage from spilling into waterways.

• To filter toxic chemicals out of wastes.

Natural resources are evenly distributed around the Earth.

• True

• False

An example of a renewable natural resource is ______.

• water

• coal

• oil

An example of a nonrenewable natural resource is ______.

• trees

• wind

• coal