HELP TEST IS TIMED What is true about atmospheric nitrogen (N2)? (Select all that apply)
-it is useable by most living organisms.
-the Bacteria eat the nitrogen and it provides them energy
-atmospheric nitrogen leaded to acid rain
-it needs to be fixed by bacteria.

4. multiple crosses were made between true-breeding lines of black and yellow labrador retrievers. all the f1 progeny were black. when these progeny were intercrossed, they produced an f2 consisting of 91 black, 39 yellow and 30 chocolate. a. propose an explanation for the inheritance of coat color in labradors. b. propose a biochemical pathway for coat color determination and indicate how the relevant genes control coat coloration.