how are some living things harmful to us
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However, animals can sometimes carry harmful germs that can spread to people and cause illness – these are known as zoonotic diseases or zoonoses. Zoonotic diseases are caused by harmful germs like viruses, bacterial, parasites, and fungi.
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- Trace essential elements such as fluorine, copper, selenium and others can be hazardous to living organisms if present at high levels. Nonessential heavy metals such as arsenic, lead, mercury, cadmium and chromium are usually toxic to organisms at much lower levels than trace essential elements.
- Interactions among organisms and their environments can be very complex because an organism gets everything it needs to survive from the biotic and abiotic parts of its environment. For example, a tree gets the energy it needs from sunlight, carbon dioxide from the air, and water and minerals from the soil.
- All living things are able to respond to stimuli in the external environment. For example, living things respond to changes in light, heat, sound, and chemical and mechanical contact. To detect stimuli, organisms have means for receiving information, such as eyes, ears, and taste buds
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