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.
Rephrase this sentence in 8th grade sentences
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Having traits that help an organism survive and have babies is what makes them biologically fit. Natural selection happens when organisms with these helpful traits have more babies and those traits become more common in the population.
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