Question

how are some living things harmful to us? ​

Answer 1

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.

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Answer 2

Explanation:

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

People depend on plants for food, clean air, water, fuel, clothing, and shelter. Nearly all food webs begin with plants, the primary producers. During photosynthesis, green plants use sunlight to change carbon dioxide from the air and water into simple sugars made of carbon, hydrogen, and oxygen.

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