Ecosystems Presentation for Grade 7 Science.

2. What is an Ecosystem?
 An ecosystem is a community of living
things that interact with each other and
with the physical world.

3. What is an Ecosystem?
 The ecosystem is the 4th Level of Biological
Organization.

4.  The plants and animals within each
ecosystem interact with each other and the
non-living elements of the ecosystem, such
as the sun, air, water and soil.

5. Interactions between Biotic and Abiotic Factors

6.  An ecosystem can be very small such as a
puddle or under a rock.
 It can also be as big as an ocean or a
desert.

7.  The balance of an ecosystem is important. All
things must work together to provide a good
living environment.
 For example, if there is not enough water,
plants and animals will die and the
ecosystem will not exist.

8. Examples of Ecosystems
 Desert
 Artic Tundra
 Rainforest
 Ocean
 African Savanna
 Swamp

9. Producers
 A living thing that can make its own food.
 Examples: Plants, Trees, Flowers

10. Consumers
 A living thing that gets its food from eating
other living things.
 Example: Polar bear eating a fish. A bird
eating a berry. A zebra eating grass.

11. Decomposers
 A living thing that breaks down other living
things to get nutrients and energy.
 Examples: Vultures eat dead animals.
Worms and beetles eat dead decaying
plants.

12. Population
 A group of living things that live in the
same place at the same time.
 Example: many penguins live in the artic;
many elephants live in the African Savanna

13. Community
 When different populations live together in
the same habitat and interact with each
other.
 Example: Elephants, giraffes, and zebras
all live together in the Savanna.

14. Abiotic
 Any non-living organisms in an ecosystem.

15. Biotic
 Any living organisms in an ecosystem.

16. Food Chain
 Shows what eats what in an ecosystem.
 Example: