6. Do you think the tree in the pictures makes food during the winter?
No. The tree cant make food without its leaves.
7. What generalization can you make about ecosystems based on Mount ST. Helens?
Ecosystems can recover from large changes.
5. Explain the terms hibernation and migration?
Hibernate. Migration: Bats hibernate during winter.
10. Describe two ways a forest fire can be helpful to plants.
A fire cab clear the forests floor, opening up spaces for plants to grow. ash from fire improves the soil.
1. Find a cause and an affect in the text.
cause: A tree in a storm. Effect: Seedlings on the forest floor have a change grow.
8. Why do you think plants returned to Mount ST. Helens before insects and other animals did?
Insects and other animals need plants for food.
2. What is one positive effect of the changes groundhogs cause? what is a negative effect?
Positive effect: Groundhogs mix soil as they dig. this helps plans. Negative effect: Ground hogs can damage crops.
4. In some areas, forest rangers start forest fires on purpose. Why do you think they might do this?
To help clear the forests of dead wood so new trees can grow.
3. What are four things in the text that can change ecosystems?
Hurricanes, fires, floods, droughts.
9. Give an example of how an animal can cause a change in an ecosystem that harms other living things.
When a beaver builds a dam, it can cause a pond to form. The pond may flood animals homes.