Your question is rather unclear but from what I can tell either there were not an even amount of Petri dishes or some of them were left open while others were not.
Answer:
The correct answer is c. the use of organisms to remove pollutants from the environment
Explanation:
Bioremediation is a process in which living organisms are involved in the treatment and removal of pollutants from the environment. Bacteria, fungi, and archaea are the organism that is widely used in bioremediation because they reproduce very fast.
These organism works on environmental pollutant and break them into simpler and harmless compound, for example, Alcanivorax or Methylocella Silvestris are the bacteria which is used to clean the oil spills in the oceans. Therefore the correct answer is c.
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:
The ozone layer helps reduce the amount of UV rays that enter the atmosphere
Explanation:
Hope this helps you out
