( ) 1 Insects and amphibians appeared. ( ) 2 Dinosaurs appeared. ( ) 3 The earth became a solid ball. ( ) 4 Small plants grew on the water. ( ) 5 Reptiles appeared. ( ) 6 Plants began to grow on dry land. ( ) 7 The earth was a cloud of dust. ( ) 8 Water appeared on the earth. ( ) 9 Shellfish and other fish appeared. ( ) 10 The universe began with a “Big Bang”. ( ) 11 Clever animals with hands and feet appeared. ( ) 12 Mammals appeared.

12

10

11

Put them into a timeline.