____ are living things that are too small to be seen without a ____. They live everywhere on Earth, including the soil, air, and water. They also live on and in larger organisms - including humans. ____ are the largest group of microorganisms. They are ____, which means they consist of only one cell, and they have no nucleus. Bacteria may be shaped like rods, spirals, or balls. Beneficial bacteria that live in our ____ help us digest the food that we eat. But harmful bacteria can live on raw ____ and eggs and make humans very sick if the food is not ____ well. ____ are like microorganisms in many ways, but scientists do not consider them ____ because they cannot grow and reproduce unless they are attached to a living cell. Viruses cause diseases like ____, ____, and chicken pox . ____ are animal-like living things. They are ____ because they provide food for animals that live in water. They, along with bacteria, are also beneficial because they help remove ____ waste from sewage treatment plants. ____ look a little like plants, but they can’t make their own food. Fungi are ____, which means they feed on dead or decaying living things. Some examples of fungi include ____, which makes bread rise, and ____, which grow on exposed bread. ____ are plant-like living things and are beneficial because they are the main producers in oceans, lakes, and rivers. Being the main producers means they are the source of food and energy for all living things. But if algae grows too fast, they can produce a ____ tide that kills fish and can make humans sick. ____ are animal-like living things. They are beneficial because they provide food for animals that live in the water.

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