Ecosystem

What is an ecosystem?

• A community of living and non-living things that work together.

• A group of animals that live in the same habitat.

• A type of forest that covers 30 percent of Earth's land surface.

• A body of water that provides oxygen for fish.

How does algae contribute to the lake ecosystem?

• It helps fish breathe underwater.

• It provides food for microscopic animals.

• It produces carbon dioxide for plants.

• It creates a balanced system in the lake.

What would happen if the algae disappeared from the lake ecosystem?

• Microscopic animals would have more food.

• Fish would have more oxygen.

• Plants would have more carbon dioxide.

• Everything else in the ecosystem would be impacted.

What percentage of Earth's land surface do forests cover?

• 50 percent

• 30 percent

• 70 percent

• 20 percent

What do forests provide to birds, wild animals, and people?

• Food and shelter

• Oxygen and water

• Sunshine and warmth

• Protection and safety

How much of the Earth's oxygen do oceans provide?

• 70 percent

• 30 percent

• 50 percent

• 20 percent

What type of animals make their home in deserts?

• Reptiles, insects, birds, and some mammals

• Fish, turtles, and seagulls

• Bears, wolves, and deer

• Monkeys, elephants, and giraffes

Fill in: provide, cover, home, lack, shelter, areas, drop, insects.

They are one of nature's treasures. They are 1)_______ with a lot of trees and 2)______about 30% of the Earth's land surface. They provide food and 3)_________to people and animals.

They take up 70% of the Earth's surface. They are 4)_______to some of the most amazing creatures on Earth. They 5)______ 50% of the Earth's oxygen.

They occupy 1/5 of the Earth's land surface. It rarely rains there. Reptiles 6)_______, birds and mammals live there. They are hot and there is a 7)______ of water and plants. However, temperatures 8)_________ at night.