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The Origin of Species
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=== The Big Ideas === * '''Variation:''' Every species has differences (or variations) among its members. Some birds might have longer beaks, while others have shorter ones. * '''Struggle for Existence:''' Life is tough! Animals and plants compete for food, space, and other resources. Not every creature will survive and have babies. * '''Natural Selection:''' Some variations make it easier for an animal or plant to survive. Creatures with these helpful traits are more likely to reproduce. Over time, these traits become more common in the population. * '''Descent with Modification:''' As species change and adapt, they give rise to new species. This means all living things share common ancestors if we go back far enough in time.
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