How do plants get the nitrogen they need to grow?
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a. they absorb nitrogen through their roots.
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b. they create it during respiration.
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c. they create it during photosynthesis.
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d. they absorb nitrogen gas from the atmosphere.

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.