Unit 05 · Evolution & Adaptation
Living things fit their homes in amazing ways — a polar bear’s thick fur, a cactus’s spines. This unit explains how those adaptations come to be. You’ll see how differences within a species, plus survival and reproduction, add up to natural selection over very long times, and how fossils give us evidence. Mastery means you can explain how a species changes over time — and why evolution is a branching tree, not a ladder.
| Criterion | Not yet | Approaching | Mastered |
|---|---|---|---|
| Adaptations & survival | Thinks an animal changes its own body on purpose to fit in. | Names an adaptation but can’t say how it helps survival. | Explains how an adaptation helps an organism survive and reproduce in its environment. |
| Variation within a species | Thinks all members of a species are exactly the same. | Notices differences but doesn’t connect them to survival. | Explains how natural differences within a species can make some individuals more likely to survive. |
| Natural selection | Believes traits an animal builds in its lifetime get passed on. | Describes survival of the fittest but skips reproduction or time. | Explains natural selection — variation, survival, and reproduction over many generations. |
| Evidence & the tree of life | Pictures evolution as a ladder from “lower” to “higher” animals. | Uses fossils as evidence but still ranks species as more or less advanced. | Uses fossils and shared traits as evidence and describes evolution as a branching tree. |
| Lab technique (natural-selection simulation) | Runs the simulation without tracking what survives. | Collects data but can’t explain the pattern it shows. | Runs a natural-selection simulation, records each round, and explains how the population changed. |
| Integration (cross-domain) | Treats the science as isolated facts; makes no cross-domain connection. | Names a link to history, reading, or writing but cannot defend why it matters. | Connects the unit to its anchor across History · Reading · Writing (plus chosen electives) and defends why the connection matters. |
“In our bird-beak game, the birds with the best beak for the food survived and had more chicks, so that beak got more common each round. Nobody changed their own beak — the ones that already had it just did better. That’s natural selection.”
“Animals evolve to get better and better. The giraffe stretched its neck and passed it on. Humans are the most evolved, right?”
You demonstrate this unit through natural-selection simulations and fossil evidence — running the activity and explaining how a population changes over time aloud, not on a multiple-choice test. A criterion counts as mastered only when you can both show the change and explain the biology behind it. Mastery is demonstrated, not awarded.
A 5-page clipboard packet — unit overview, key terms, the mastery rubric, anchor examples, and a score sheet you can print and grade against.