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How Living Things Interact in EcosystemsCarbon Dioxide – Oxygen CycleAnimal Plant Interactions

+Carbon Dioxide – Oxygen Cycle

when things interact, they come into contact with and affect one another

living things interact with non-living things in their environment

+Carbon Dioxide – Oxygen Cycle

Plants and Animals depend on each other to survive

+Carbon Dioxide – Oxygen Cycle

Plants need carbon dioxide to make their own food

Plants give off oxygen.

Animals and Humans need oxygen to breathe

Animals and Humans breathe out carbon dioxide

+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.

+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

+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

+Animal Plant Interactions

Changes that affects plants also affects animalsIf trees in a forest are cut down birds & insects lose their shelter.