Environment factors can influence natural selection because they can increase or decrease

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environmental factors can influence natural selection by increasing or decreasing the amount of genetic variation in a population. Increasing genetic diversity usually occurs via mutation, whereas decreasing genetic diversity can occur when that particular allele reduces the chances of individuals with that trait to reproduce (e.g. the organism often dies before breeding). 

false because ozone (o3) depletion does not cause global warming, but both of these environmental problems have a common cause: human activities that release pollutants into the atmosphere altering it.

global warming is caused primarily by putting too much carbon dioxide into the atmosphere when coal, oil, and natural gas are burned to generate electricity or to run our cars.

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