7A. Whales are marine mammals that share a common ancestor with a group of land mammals that includes hippos. Which observation provides evidence of the shared ancestry of whales and hippos? *

Which statement correctly describes other ways in which nebulae and stars are different? a. a star always has a higher density than a nebula. b. stars can form inside a nebula but a nebula can never be produced by any star. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star. reset submit