I believe the correct answer is the presence of harmful bacteria.
After development of Robert Hooke's light microscope, early elements of the cell theory were proposed. The invention of light microscope made it easy to study the structure of microscopic cell. After deciphering the cell structure with the help of a light microscope the cell theory was proposed. The invention of microscope was a big break through in the scientific world as it enabled researchers to study the microscopic structure. Later, the microscopes were modified to study the cellular organelles and prokaryotic microorganisms.
Cell theory provides the foundation for the study related to cells such as molecular biology, cell biology, etc.
Answer:
The answer is biotic and abiotic.
Explanation:
The biosphere contains living and non-living organisms and the scientific name for living organisms is "biotic" while the scientific name for non-living organisms is "abiotic".
All animals, plants, bacteria etc can be given as an example to biotic organisms and natural structures, mountains, soil etc can be given as examples of abiotic.
I hope this answer helps.
