Answer: A. Fossil
Fossil fuels release gases into the environment. These gases are pollution and they also contribute to global warming and climate change.
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Crossing over, or recombination, is the exchange of chromosome segments between nonsister chromatids in meiosis. Crossing over creates new combinations of genes in the gametes that are not found in either parent, contributing to genetic diversity.
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The leading cause of memory loss between the ages of 15 and 25 is traumatic brain injury.
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