Being biologically fit means having traits that increase an organism's chances of survival and reproduction in its environment. Natural selection occurs as individuals with advantageous traits are more likely to survive, reproduce, and pass on those traits to their offspring, leading to an increase in the frequency of those traits in the population over time.

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1. What does being biologically fit entail for an organism?
2. Why does natural selection favor individuals with advantageous traits?
3. How does having advantageous traits increase an organism's chances of survival and reproduction?
4. How does the passing on of advantageous traits to offspring contribute to the process of natural selection?
5. Why do populations tend to show an increase in the frequency of advantageous traits over time?