Changes in Habitats

How do beavers change their environments?

• by hibernating

• by migrating

• by building dams

• by draining the wetlands

Which of the following would be a beneficial change caused by a fire in the grasslands?

• It can add nutrients (food) to the soil to help plants grown

• It can harm trees, which are homes to many organisms.

• It can destroy plants, which are food for animals

• It can bring shelter to the grasslands.

Which of the events below would threaten the survival of freshwater lake fish?

• Increase in water level of the lake

• runoff with pollution from cities, factories, and farms

• an increase in the fish's food supply

• heavy rainfall from thunderstorms

Entire forests were once cut for timber. What happens when a forest is cleared of its trees?

• There were more insects.

• There is less rain.

• There is less habitat for animals.

• New trees grow back quickly.

Which of the following is an example of how nonliving things or natural changes can change a habitat?

• A flood takes place when the water in a river rises.

• Very large trees keep smaller trees from growing.

• Beavers cut down trees to build their damns.

• Pine beetles eat into the pine trees and kill them.

What are the causes of hibernation?

• The seeds do not have enough water or the right temperature.

• There is not enough food or the temperatures are too cold.

• The water and air is too polluted by humans.

• The animals are too tired from hunting food.

Which of the following is an example of a food chain?

• sun------ grass-------- deer-----bacteria

• deer----sun----bacteria----grass

• grass----sun----deer---bacteria

• bacteria----sun----grass----deer

What is a negative effect of mining the environment?

• It can allow us to have resources such as minerals.

• There are no negative effects to mining.

• It can cause sinkholes and pollute the water.

• it can add nutrients to the soil and help plants grow.

What happens to both plants and animals if they are unable to respond to changes in their habitat for many years?

• They will die and eventually the species will become extinct.

• They will not germinate or start to grow.

• They overpopulate and then there are too many of the species.

• They will hibernate for years until they can get food.

Which or the following is a change caused by humans that has no beneficial effects?

• fires

• polluting the air and water

• landslides caused by flooding

• over farming land.