Free About 1 hr1 learner Rev. 2026-10-11 1

There are about as many bacterial cells living in your body as human ones. Every animal on Earth carries the remains of ancient bacteria in its cells. And the oxygen you just breathed in was split from water by a leaf.

Biology is full of facts like these, and this course connects them. It starts with what counts as alive and how biologists test their ideas, follows energy and heredity through the cell, and builds to evolution and ecology. The last lesson turns to the decisions biology now hands to ordinary citizens: gene editing, failing antibiotics, engineered crops, and what DNA really says about race.

Levels

  1. 1 1. What Life Is and How Biologists Know It 5-question quiz
  2. 2 2. Cells: The Units of Life 5-question quiz
  3. 3 3. Energy and Metabolism 5-question quiz
  4. 4 4. Genes, DNA and Heredity 5-question quiz
  5. 5 5. Evolution by Natural Selection 5-question quiz
  6. 6 6. The Diversity of Life 5-question quiz
  7. 7 7. Ecology: How Living Things Fit Together 5-question quiz
  8. 8 8. Biology, Medicine and Society 5-question quiz

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