Organisms are classified and divided in a community based on the modern classification system that was published by Carolous Linnaeus in the 18th century.
This criteria is also known as the Linnean system of classification, where the organisms are classified according to the following: Species, Genus, Family, Order, Class, Phylum and Kingdom.
Only plant cells have a cell wall
The answer B - unicellular prokaryotes
Answer: C. A very strong acid
Explanation: The lower you go, the more acidic it is. The higher it is the more basic it is.