https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:the-cell-cycle-and-differentiation/x230b3ff252126bb6:activity-how-do-stem-cells-give-rise-to-the-diverse-cell-types-that-make-up-the-human-body/a/activity-how-do-stem-cells-give-rise-to-the-diverse-cell-types-that-make-up-the-human-body 2026-02-27T18:40:42.57607561Z Activity: How do stem cells give rise to the diverse cell types that make up the human body? Make science come alive in your classroom with this free hands-on activity aligned to high school standards. article https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:gene-expression-and-regulation/x230b3ff252126bb6:activity-how-can-gene-mutations-help-us-understand-the-formation-of-flowers/a/activity-how-can-gene-mutations-help-us-understand-the-formation-of-flowers 2026-02-27T18:40:42.57607561Z Activity: How can gene mutations help us understand the formation of flowers? Make science come alive in your classroom with this free hands-on activity aligned to high school standards. article https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:inheritance-and-variation-of-traits/x230b3ff252126bb6:activity-why-do-kittens-in-a-litter-often-look-so-different/a/activity-why-do-kittens-in-a-litter-often-look-so-different 2026-02-27T18:40:42.57607561Z Activity: Why do kittens in a litter often look so different? Make science come alive in your classroom with this free hands-on activity aligned to high school standards. article https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:mechanisms-of-evolution-hs/x230b3ff252126bb6:activity-why-are-male-birds-often-more-brightly-colored-than-females/a/activity-why-are-male-birds-often-more-brightly-colored-than-females 2026-02-27T18:40:42.57607561Z Activity: Why are male birds often more brightly colored than females? Make science come alive in your classroom with this free hands-on activity aligned to high school standards. article https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:common-ancestry-and-phylogeny/x230b3ff252126bb6:activity-how-can-we-reconstruct-the-evolution-of-species-across-islands/a/activity-how-can-we-reconstruct-the-evolution-of-species-across-islands 2026-01-20T18:50:43.020812347Z Activity: How can we reconstruct the evolution of species across islands? Make science come alive in your classroom with this free hands-on activity aligned to high school standards. article https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:energy-and-matter-in-biological-systems/x230b3ff252126bb6:activity/a/activity-why-do-animals-often-prefer-to-eat-ripe-fruit 2026-02-27T18:40:42.57607561Z Activity: Why do animals often prefer to eat ripe fruit? Make science come alive in your classroom with this free hands-on activity aligned to high school standards. article https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:energy-and-matter-in-biological-systems/x230b3ff252126bb6:activity-why-do-plants-have-different-kinds-of-leaves/a/activity-why-do-plants-have-different-kinds-of-leaves 2026-02-27T18:40:42.57607561Z Activity: Why do plants have different kinds of leaves? Make science come alive in your classroom with this free hands-on activity aligned to high school standards. article https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:ecology-and-natural-systems/x230b3ff252126bb6:activity-why-are-human-shark-interactions-increasing-around-cape-cod/a/activity-why-are-human-shark-interactions-increasing-around-cape-cod 2026-02-27T18:40:42.57607561Z Activity: Why are human-shark interactions increasing around Cape Cod? Make science come alive in your classroom with this free hands-on activity aligned to high school standards. article https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:biodiversity-and-human-impacts/x230b3ff252126bb6:activity-how-does-biodiversity-vary-in-my-community/a/activity-how-does-biodiversity-vary-in-my-community 2026-02-27T18:40:42.57607561Z Activity: How does biodiversity vary in my community? Make science come alive in your classroom with this free hands-on activity aligned to high school standards. article