20 POINTS Sharks, whales, and dolphins share similar features such as body shape and the position of fins. However, sharks have gills for breathing, while whales and dolphins have lungs. These differences indicate that the organisms share a common ancestor for Whales also possess a vestigial pelvic bone. The presence of the pelvis bone may indicate that whales THE OTHER BLANK IS 1.have legs inside their bodies 2.evolved from organisms 3.will have legs in the future