Recycling of Materials
Energy flows and matter recycles through an ecosystem.
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Define a population as all individuals of a species that exist together at a given place and time; and explain that all populations living together in a community, along with the physical factors with which they interact, compose an ecosystem.
Using food webs, identify and describe the ways in which organisms interact and depend on one another in an ecosystem.
Explain how insects and various other organisms depend on dead plant and animal matter for food; and describe how this process contributes to the system.