What category of organisms can mate and produce fertile off spriing

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

What do all celular activities in living organisms use as a source of energy?

Satellites orbit earth in the a) mesosphere b) troposphere c) stratosphere d) thermosphere