Third graders explore the effect of environments and environmental changes on the organisms that inhabit them.
(3.9A) Characteristics of Environments
The student is expected to observe and describe the physical characteristics of environments and how they support populations and communities within an ecosystem.
(3.9B) Energy Flow
The student is expected to identify and describe the flow of energy in a food chain and predict how changes in a food chain affect the ecosystem such as removal of frogs from a pond or bees from a field.
(3.9C) Effects of Environmental Changes on Ecosystems
The student is expected to describe environmental changes such as floods and droughts where some organisms thrive and others perish or move to new locations.
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