The answer is A it's the action of purifying water
The atomic number where as the atomic mass refers to the number of both neutrons and protons and the symbol refers to the element
The aquatic organism such as fishes will adapt themselves to have strong fins so as to swim upstream against the current. * The aquatic plants will adapt themselves to grow on the rocks present in the stream. * They may adapt themselves to have a streamlined body that resist being washed downstream by the current.Answer:
Explanation:
