Where does the carbon in fossil fuels come from?

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

Sarah and john are having a discussion on genetic diversity sarah believes it happens over a long period of time john believes it happens immediately who is correct

Which of the following best explains the changes in biodiversity shown in the graph?