Identify external structures in animals and explain how each supports a survival function such as protection, movement, feeding, or reproduction.
Every animal has external structures, parts you can see on the outside, that help it survive, grow, move, and reproduce. A turtle's hard shell protects its soft body from predators. A bird's wings let it fly to find food or escape danger. A structure only makes sense once you ask what job it does for the animal.
Different animals solve the same survival problem with very different structures. A porcupine uses sharp quills for protection, a skunk uses a spray, and a turtle uses a shell. All three structures serve the same function, protection from predators, even though they look nothing alike.
Mastery looks like: They can name an external structure on a given animal and correctly explain which survival function, protection, movement, feeding, or sensing, it supports.
Common stumbles: Describing what a structure looks like without connecting it to a function; assuming animals intentionally chose their structures rather than describing what the structure actually does.