Plants and animals interact in ecosystems through carbon dioxide and oxygen cycles. Plants take in carbon dioxide and release oxygen through photosynthesis, while animals breathe in oxygen and release carbon dioxide. Populations of living things in an ecosystem interact to obtain resources like food, water, and shelter. Animals depend on plants for food and shelter, while plants rely on animals to distribute seeds and provide nutrients when they die.

1. +
How Living Things
Interact in Ecosystems
Carbon Dioxide – Oxygen Cycle
Animal Plant Interactions

2. +
Carbon Dioxide – Oxygen Cycle
when things interact, they come
into contact with and affect one
another

living
things interact with nonliving things in their environment

3. +
Carbon Dioxide – Oxygen Cycle
Plants and Animals depend on
each other to survive


4. +
Carbon Dioxide – Oxygen Cycle
Plants need carbon dioxide to make
their own food

Plants
give off oxygen.
Animals
breathe
Animals
and Humans need oxygen to
and Humans breathe out
carbon dioxide

5. +
Animal Plant Interactions
In an ecosystem populations of
living things interact to get
resources

Population
– all the organisms of
a species living in the same area.

6. +
Animal Plant Interactions
Resource – something that a
living thing needs to stay alive.

examples: food, water, living
space, sunlight
Plants
not only supply a source of
food but they also provide shelter

7. +
Animal Plant Interactions
Animals depend on plants but
plants also depend on animals.

Animals
provide nutrients for
plants when animals die
Animals help plants reproduce

8. +
Animal Plant Interactions
Changes that affects plants also
affects animals

If
trees in a forest are cut down birds
& insects lose their shelter.