Bacteria convert atmospheric nitrogen to which of the following in the process of nitrogen fixation? phosphorus nitrogen gas nitric acid ammonia question 2 during which of the following steps of the water cycle is water changed from a vapor state to a liquid state? condensation transpiration evaporation precipitation question 3 what impact can deforestation have on the water cycle? photosynthesis increases, thereby increasing the amount of carbon dioxide in the air. transpiration declines. carbon dioxide is released into the air as trees are burned. the amount of nitrogen-fixing bacteria increases question 4 which of the following is the source of energy for the water cycle? question 4 options: gravity winds the sun volcanic eruptions question 5 why is nitrogen fixation such an important step in the nitrogen cycle? bacteria convert the fixed nitrogen back into n2. plants can't use nitrogen in the form of n2. soil nitrogen is different. decomposers need to use nh4+.