Why are there fewer phytoplankton in the mesopelagic zone relative to the epipelagic zone?
lower light levels
lower oxygen levels
lower nutrient levels
lower water temperature

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