Mid ocean ridges best represents?

What's the waste product of electrons and pyruvate combining in fermentation?  

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

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient