Lesson 8: Human Impact on the Environment Answers

Which factor can cause secondary succession?

Why are lichens a good pioneer species after a volcanic eruption?

Which statement best describes ecological succession?

The number of rhinoceroses has decreased to near extinction. How are rhinoceroses classified under the Endangered Species Act?

Which factors involving the activities of people are a threat to biodiversity?

What is most likely to result immediately after a rainforest in Brazil is clear-cut?

The diagram below shows the stages of succession in a forest ecosystem. Which area shows the climax community of secondary succession?

According to the pie chart, which cause results in the most extinctions?

In one species of bird, there are three varieties of feather color. What is this an example of?

Which disturbance would result in primary succession?

On May 18, 1980, Mount St. Helens in Washington State experienced a huge volcanic eruption after a magnitude 5.1 earthquake. During the eruption, hot ash and pumice poured down the west, south, and east sides of the mountain, melting the snow and ice at the top of the volcano and producing volcanic mudflows. Which type of process first occurred in the ecosystem around Mount St. Helens after it erupted?

Which is one event that may lead to Primary succession?

Which of the following could result in the extinction of a species?

Rhinoceroses are being poached at a rate of two or three a week in Africa and Asia. Which type of diversity is being lost as the population of rhinoceroses becomes very small?

How does a whale fall community affect ocean sediment?