1) In 1980, Mount St. Helens, a volcano in Washington, erupted, causing hundreds of square miles around the volcano to be destroyed. Plants, trees, and animals were destroyed. It took several years for animals to be able to survive in the area again. a) The plants used up all the good air. b) The plants and trees were destroyed, so the animals had no food. c) It was too dirty for them to come back. d) The animals were scared.

Biological change practice questions!

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