Answer:
Nitrogen is present in the atmosphere in a molecule form about 78 percent. This nitrogen comes to the earth with the water through rainfall. Some nitrogen fix by beneficial microorganisms such as Cyanobacteria and Azotobactor which are present in the roots of higher plants. These microorganisms convert nitrogen molecule into nitrates and used by the plants. There are some other microorganisms which again convert nitrate into nitrogen molecules, called denitrifying bacteria and nitrogen molecule goes to the atmosphere again and complete the cycle.
Answer:
Yes.
Explanation:
Yes, they are necessary for photosynthesis.
The answer is a. accessible population because an accessible population is the portion of the target population to which the researcher has reasonable access.
Answer:
initially by meiosis, then by mitosis( last choice)