Topics: Microorganism - Diseases Quiz
Which observation supports the claim that microorganisms are helpful to ecosystems?
A. Microorganism are to small to been seen without special equipment.
B. Microorganism need water and energy to survive.
C. Millions of microorganism can often be found in soil.
D. Microorganisms break down dead plants and animals, making nutrients available.
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The flu is caused by
A. bacteria
B. virus