wunder beta🦕 Evolution
How life diversified from a shared ancestor through natural selection.
What you’ll learn
- Explain what evolution is and the conditions that make it possible.Evolution is descent with modification: all life shares common ancestors and changes across generations. It requires heritable variation and vast stretches of time to unfold.
- Describe how natural selection produces adaptation and new species.Organisms compete to survive and reproduce, and those with favorable heritable traits leave more offspring. Over time this produces adaptations and, through isolation, entirely new species.
- Identify the main lines of evidence that support evolution.Fossils, comparative anatomy, and DNA independently confirm common descent, and evolution is directly observable today in bacteria, insects, and viruses.
Questions this course answers
What did Darwin mean by descent with modification?
Descent with modification means species evolve from shared ancestors through gradual heritable change, forming a branching tree of life.
Why is heritable variation essential for evolution?
Evolution requires inherited differences among individuals; without variation there is nothing for natural selection to favor.
Roughly how long has life existed on Earth?
Life has existed for over 3.5 billion years, providing the deep time needed for gradual evolutionary change.
In evolutionary terms, what does fitness mean?
Fitness refers to how successfully an organism survives and reproduces, passing its traits to the next generation.
How did the peppered moth illustrate natural selection?
In polluted areas, dark moths were better camouflaged and survived more often, so the dark trait became more common.
What commonly triggers the start of speciation?
When populations are separated and stop interbreeding, they accumulate different changes and can diverge into new species.
Grounded in trusted sources
- On the Origin of Species by Charles Darwin (1859)
- Understanding Evolution, University of California Museum of Paleontology, evolution.berkeley.edu
- "Evidence Supporting Biological Evolution," National Academy of Sciences (NCBI Bookshelf NBK230201)
- Encyclopaedia Britannica, "Evolution" (britannica.com)
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