In order for plants and animals to be able to use nitrogen, n2 gas must first be converted to more a chemically available form. review the picture of the nitrogen cycle. one type of organism is responsible for "fixing" nitrogen so other organisms can use the element. what organism is this? a) fungi b) plants c) animals d) 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.