Microorganisms such as bacteria can be removed by disinfection. Certauns substances called biocides are addes to water to make it pure. Purification can also be done by UV-light .
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B. The animals at each level use energy, so only a small amount of their energy is available to the next level.
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Bacteria, but out of those three then it would be land, because animals (dinosaurs) Could not live without food (plants) and plants can't grow without land.
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Vegetation reproduction <span />
Pathogens are harmful because they are tiny organisms like a bacterium, a fungi, or a virus that causes people to be sick. It causes diseases like the rhinovirus which is the cause of common cold. It is commonly found in hospital wastes and even the water used in swimming.