Succession and Extinction — Unit test Answers

Which relationship is shown in the graph?

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?

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?