• How does energy flow within the Biosphere ecosystem?
• How do nutrients, like carbon dioxide, flow within the Biosphere ecosystem?

• Living things get their energy through food chains.
• Most of the matter that makes up plants comes from the air.
• All food can be traced back to plants.
• Decomposers break down dead things and recycle nutrients.
• Organisms in an ecosystem depend on one another to cycle energy and nutrients.
• All energy in an ecosystem first came from the Sun.

If you haven't completed your final Biosphere model, now is the time to do so. We'll review what should be included in your ecosystem in the next few slides.

There are many organisms you could have chosen for your Biosphere ecosystem! Living things depend on one another to stay alive and healthy. Check your Biosphere ecosystem to make sure:

Every consumer has something to eat

When living things die, their nutrients need to be put back into the ecosystem. Make sure you have:

At least one decomposer

Producers make their own food using energy from the sun. Consumers get their energy from eating producers and other consumers. Check your model for:

Producers

Energy flows through an ecosystem. Everything depends on the sun as a source of energy. Check your model for:

A source of energy