Succession and Extinction Answers

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

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

Which factor can cause secondary succession?

Which statement best describes ecological succession?

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

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?

How does a whale fall community affect ocean sediment?

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

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

What is the role of a pioneer species in primary succession?