20. The answer is 1 (Precambrian)
21. The answer is 4 (Pennsylvanian)
22. The answer is 2 (Bony Fishes, Dinosaurs, and Mammals)
23. The answer is 2 (Reptiles)
pros: travel, skill development, job growth
U thought you was getting free answer my points now thanks for thats point tho
It protects ur toes and foot from dangerous germs like what u do in the bathroom.Also it prevents us from fungus by keeping our foot on the clean soul of ur shoe