It would be D because it it based off of knowledge and you are proposing a hypothesis before conducting an experiment to predict what will happen
<span>Nitrogen fixation is made by numerous prokaryotes, including bacteria, actinobacteria, and certain types of anaerobic bacteria. Organisms that fix nitrogen are called Diazotrophs.</span>
Moonlight is no longer thought of as the cause. In the 16th century, moonmilk, a soft white limestone precipitate found in caves, was thought to be caused by the rays of the Moon.
Atoms of different elements always combine in the same way.
John Dalton noted that if the components are added to one exacerbated, the share of their masses will dependably be the same. Dalton's been an English scholar. The component mass of that mix is measured by the confirmation of the presence of molecules assembled by John Dalton.
