How do living things cause changes on earth?

1. earthworms

1.1. dead plants

1.2. dead leaves

1.3. soil

1.4. mixing it and helping it breathe

2. beavers

2.1. dams

2.2. have a new home to store food when it is cold

2.3. making the river deeper and longer

3. wolves

3.1. deer

3.2. valleys and gorges

3.3. trees, forests, number of animals - beavers, birds, etc.

3.4. physical geography