Language Partial Activity (May)

1. How many beavers were in Tierra del Fuego in 1946?

• 50

• 42

• 12

• 15

2. How did beavers change Tierra del Fuego?

• They started hunting the elk and soon became predators.

• They destroyed the forests and dammed lakes so the water did not flow.

3. What happened in Yellowstone when the gray wolf disappeared?

• Yellowstone's ecosystem was in balance again.

• Beavers built dams across rivers.

• The elk ate too many plants, and other animals disappear, because they didn't have enough food.

4. How did the reintroduction of wolves change Yellowstone?

• The wolves hunted the elk, so soon they were in balance.

• Beavers have no predators in Tierra del Fuego.

5. In which park did people help the ecosystem?

• in Yellowstone

• In Tierra de Fuego

6. In which park did people harm the ecosystem?

• in Yellowstone

• in Tierra de Fuego

7. What does it mean for an ecosystem to be "in balance"?

• No predators in an ecosystem.

• Living things have food and shelter in order to survive.

8. These are examples of predators.

• snails, worms

• turtles, rabbits

• wolves, bears, tigers

• trees, flowers, bees

9. This is an_____

• wolf

• elk

• beaver

10. This is a_____

• wolf

• elk

• beaver