Scientific Perspectives: Why Evolution Is True

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Evolution Explained

Evolution is the scientific theory that explains the diversity of life on Earth and how species change over time through natural selection.

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Evidence from Fossils

The fossil record provides physical evidence of evolution, showcasing transitional forms like Tiktaalik and Archaeopteryx.

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Genetic Comparisons

Similarities and differences in DNA sequences reveal evolutionary relationships between species and when they shared a common ancestor.

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Biological Clocks

Genetic mutations accumulate at a constant rate, allowing scientists to estimate when species diverged from a shared lineage.

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Adaptations and Natural Selection

Natural selection favors traits that improve an organism's chances of survival and reproduction, leading to the emergence of new species.

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Peppered Moth Case Study

The peppered moth's color adaptation during industrialization demonstrates the power of natural selection.

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Antibiotic Resistance

Bacteria evolve resistance to antibiotics through natural selection, with resistant strains surviving and reproducing.

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Geographic Distributions

Biogeography, the study of species' geographic spread, provides insights into their evolutionary histories and migration patterns.

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Evolutionary Relationships

Comparing DNA sequences allows scientists to determine how closely related different species are and when they diverged.

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Transitional Fossils

Fossils like Tiktaalik and Archaeopteryx exhibit characteristics of both ancestral and more modern forms, bridging evolutionary gaps.

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Genetic Mutations

Random changes in an organism's DNA can introduce variations that natural selection acts upon, driving the evolution of new traits.

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Fundamental to Biology

Understanding evolution is crucial for comprehending the natural world and humanity's place within it.

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