<em>A<u> population </u>is a group of the same kind of living things in a ecosystem.</em>
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B
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B. Consisting of billions of galaxies
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The primary reason that fossil fuels are harmful to the environment is that their use produces large amounts of greenhouse gasses. These gasses cause heat to build up in the atmosphere and raise the average temperature of the planet. Fossil fuels also pollute the air when they're burned and may cause environmental damage when they're mined
