https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:evolution/x0c5bb03129646fd6:activity-how-can-we-use-skeletons-and-fossils-to-understand-whale-evolution/a/activity-how-can-we-use-skeletons-and-fossils-to-understand-whale-evolution 2026-02-27T17:50:36.702607024Z Activity: How can we use skeletons and fossils to understand whale evolution? Make science come alive in your classroom with this free hands-on activity aligned to middle school standards. article