Life on Earth 0.0 / 5 ? Environmental Science/StudiesEvolutionUniversityNone Created by: LachlaCreated on: 07-05-19 13:48 42753186 Across 1. another name for radiometric dating (8) 4. rock aging (8) 5. intermediate between bird and reptile (12) 6. mammals that lay eggs (10) Down 2. gives clues as to an organisms ancestory (organ/bone) (9) 3. type of teeth (vestigial structure) (6) 7. animal that had vestigial bones to indicate its ancestors had legs (5) 8. radiometric dating depends on? (radioisotopes) (5)
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