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Let's practice what you have learned in this lesson.

Interactive exercise. Assistance may be required. Directions: Match the term to its definition.

Directions: Determine if the statement indicates helpful or harmful microorganisms. Check the box for each description.

	Helpful	Harmful
1. Bacteria cause tooth decay.	Interactive button. Assistance may be required. Check Your Answer	Interactive button. Assistance may be required. Check Your Answer
2. Microorganisms break down a dead wolf.	Interactive button. Assistance may be required. Check Your Answer	Interactive button. Assistance may be required. Check Your Answer
3. Bacteria fix nitrogen on the roots of a peanut plant	Interactive button. Assistance may be required. Check Your Answer	Interactive button. Assistance may be required. Check Your Answer
4. Tom steps on a nail and may have tetanus.	Interactive button. Assistance may be required. Check Your Answer	Interactive button. Assistance may be required. Check Your Answer
5. Bacteria producing vitamin K.	Interactive button. Assistance may be required. Check Your Answer	Interactive button. Assistance may be required. Check Your Answer
6. E.coli digests hay for a giraffe.	Interactive button. Assistance may be required. Check Your Answer	Interactive button. Assistance may be required. Check Your Answer