Many scientists classify viruses as non-living. the single, most important reason why viruses are classified as non-living is that they

answer: b)  

are not composed of cells.

explanation:

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.

it takes hundreds of years to become stable.

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