Explain the statement “ nutrients do not flow in one direction in the ecosystem, they recycle through the ecosystem “

What is true of sea slugs in these orders

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

Why has two different alleles for the same trait?