Question

questions 17 and 18 refer to the following. the diagram below shows a simplified nitrogen cycle. which of the following processes is illustrated by the downward arrows from the atmosphere that show the conversion of nitrogen gas into usable forms available to producers? a nitrogen assimilation b nitrogen fixation c photosynthesis d weathering

Explanation:

Nitrogen fixation is the process by which atmospheric nitrogen gas ($N_2$) is converted into ammonia ($NH_3$) or other nitrogen - containing compounds that are usable by producers (plants). Nitrogen assimilation is the uptake of nitrogen compounds by plants. Photosynthesis is the process by which plants convert carbon dioxide and water into glucose and oxygen using light energy. Weathering is the breakdown of rocks and minerals.

Answer:

B. Nitrogen fixation