Exercise 3: Crossword Puzzle Using The Terms In This Chapter, Complete The Puzzle Below. 10 Across 1. Hard Parts, Such As Bones, Teeth, And Fos. Silize Most Easily 4. A Series Of Fossils Shows How Mammals Evolved From 5. Paleontologists Recently Found Fossils Of An An- Cient With Hind Legs. 6. Sometimes A Whole Organism Is Preserved, If Does Not Occur. 10.