This lesson is designed to train an entire class or small group of students to accurately use a LaMotte Dissolved Oxygen test kit. Students are introduced to the concept of dissolved oxygen and the factors that influence the amount of D.O. in an aquatic environment.

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1. Physical factors of an ecosystem affect the type and diversity of organisms found in the system.

2. Plants and animals have a more limited capacity than humans to adapt; thus, their environment must fit their needs.

3. Change in the environment has a great affect on the ability of organism to survive within a particular ecosystem.