Evidence for Evolution
Aligned to HS-LS4 — Next Generation Science Standards.
What this lesson teaches
Natural selection drives evolution: heritable traits that improve survival become more common. Fossils, anatomy, and DNA provide evidence.
Worked example
Antibiotic-resistant bacteria evolve because resistant individuals survive treatment and reproduce, passing resistance on.
Practice questions
- How does natural selection lead to change over time?
- Name two kinds of evidence for evolution.
- Why do antibiotics become less effective over time?
Watch the lesson
Every lesson comes with a video taught in English and Spanish — the same video the QR code in the printed workbook opens.
▶ Watch this lessonEn español
Evidencia de la evolución
La selección natural impulsa la evolución: los rasgos heredables que mejoran la supervivencia se vuelven más comunes. Los fósiles, la anatomía y el ADN aportan evidencias.
Ejemplo: Las bacterias resistentes a antibióticos evolucionan porque los individuos resistentes sobreviven al tratamiento y se reproducen, transmitiendo esa resistencia.
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