51Grade 6th , 7th, 8th
Flow of
Resources in an Ecosystem
•Interaction of Organisms: Predators, parasites, competition and cooperation.
•Recycling of
Energy and Nutrients: 1. Producers (plants) obtain energy from sunlight,
water and nitrates from soil. 2.
Consumers (animals) eat plants or other animals; provided nitrates and CO2 to be used by
plants. 3.
Decomposers (bacteria, fungi) break down dead organisms into
organic compounds.
•Ecological Succession: Drastic events, like fire, bring a series
of changes to an
ecosystem.