Helppp ASAP. When nomadic tribes moved from place to place following migrating food sources, the size of the world's did not threaten the availability of natural resources .

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