Answer:
Option b. Lowering the pH to kill pathogenic bacteria is correct answer.
Explanation:
bacterial motors are sensitive to pH. By decreasing the pH bacterial motors stops working. This was identified in a new research. But, with the weak acids and a lower internal pH they slow and ultimately stop moving (became dead).
Reference: Powell, K. Acid stops bacteria swimming. Nature (2003).
Our planet has so many different ecosystems in which species live in. Whether it is the rainforest or a desert region, it seems that almost any place on earth can be one in which species have learned to adapt to living there. In short, yes there is great diversity on this planet.
