1 Microorganism

Diverse group of tiny, simple forms of life that include bacteria, algae, fungi, protozoa, and viruses. They are too small to be seen with the naked eye and are normally viewed by means of a microscope.

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2 Bacteria.

They are single-celled microorganisms. Their cell structure is unique in that they don't have a nucleus and most have cell walls similar to plant cells.

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3 Germ

These tiny microbes are the causes a disease in a plant or animal. They are so tiny that they can only be seen through a microscope. There are several different kinds including bacteria, viruses, protozoans, and fungi.

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4 Virus

a tiny, infectious particle that lives inside of living organisms.

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5 Decay

decompose, rot, putrefy, spoil , fall apart

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6 Harmful

involving possible injury, pain, or loss 

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7 Illness

a change in a living body (as of a person or plant) that prevents it from functioning normally.  To be sick

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8 Hygiene

Doing things for yourself that keep you healthy

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9 Microbe

a very tiny and often harmful living thing  

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10 fungi

Yeast and molds

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11 Protozoa

Neither plants nor animals. Most are so tiny that they can be seen only with a microscope. Amoebas are examples of these organisms

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12 Algae

These are very important because they make much of Earth's oxygen, which humans and other animals need to breathe. Some examples, such as seaweed, look like plants.