Mississippi Science ZOO.1.2

ScienceGrades 9–12Zoology I and II

The Standard

Describe how fossil records document the history of life on Earth.

2026 Mississippi College- and Career-Readiness Standards for Science · Evolution

Teacher's field guide

What Students Need to Do: Students order fossils using rock layers and dates. They compare fossils from different times to explain when groups appeared, changed, or disappeared.
What Mastery Looks Like: A student can use a rock column to identify which fossil is older and point to evidence of change over time. They can explain that the fossil record is incomplete.
Common Misconceptions: Students may think upper rock layers are older or that every organism becomes a fossil. They may take a gap in the record as proof that an organism did not exist.
How to Assess It: Draw three undisturbed layers with a trilobite at the bottom, a dinosaur in the middle, and a horse at the top. Ask students to order the fossils and write one claim about past life that the layers support.

Lesson moves

Stack three paper rock layers with trilobite, dinosaur, and horse fossil cards; have pairs place the oldest fossil at the bottom.
Give students two dated horse fossil drawings and ask: What changed in the feet, and what can these drawings not tell us?
Play a fossil timeline relay: teams sort cards labeled trilobite, 500 million years ago; dinosaur, 230 million; and horse, 55 million.
Choose a dated fossil from the Smithsonian's online collection and write a museum label stating when its organism lived.

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A ready-to-print activity worksheet aligned to ZOO.1.2, with an answer key for the teacher on its own page. No account needed.

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