4. Why is nitrogen fixation so important? O A. Symbiotic soil microbes convert nitrogen gas to a form that the plants can use.
O B. Symbiotic soil microbes add nitrogen to the air so the plants can use it.
O C. Nitrogen is scarce around farmlands
O D. Symbiotic soil microbes make an enhanced form of nitrogen that's better than what the plants normally use

The image shows a sandstone formation with visible bands of different colors. what do the bands indicate about how this sedimentary rock was formed? choose two answers. a). the rock was made from more than one material. b). water was absent during the compaction and cementation process. c). sediments and other matter were deposited in layers before lithification. d). the rock was stretched horizontally by the pressure from surrounding rocks. e). layers of hot liquid in the rocks cooled and solidified at different tempatures