PLEASE HELP WILL GIVE BRAINLIEST!! 6. Fill in the blanks about the nitrogen cycle. Nitrogen from the atmosphere is fixed into a usable form in the soil by or by . Sometimes little pockets of bacteria live in on plant roots, helping t plants get the nitrogen they need for their tissues. Once the nitrogen is fixed in the soil, plants will pick up with their . Animals will get their nitrogen by plants or other organisms in the food chain. When plants and animals die, the nitrogen will be returned to the soil by . return nitrogen in the soil to the atmosphere by converting to gas.​