Three domains and six kingdoms
An organism is defined as pathogenic if it can cause diseases in humans. The organisms that cause diseases' like whooping cough, influenza and diphtheria are this kind of pathogen.
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Animals contribute water vapor back into the atmosphere by respiring, breathing out water vapors that rise to the atmosphere. They're perspire to prevent overheating; during this process, water is excreted through the pores and evaporates off the skin, cooling the animal by absorbing the external heat.
