Why can particles diffuse? Make it like a one sentence pls

9. the history of life on earth is recorded in

In the respiration-photosynthesis cycle shown above, what are the products of cellular respiration that belong in box 2?

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