Answer:
The correct answer will be scientific method.
Step-by-step explanation:
The scientific method is a step by step process used by scientists to study the world around them.
The scientific method or protocol is performed by the scientists to explain the process taking place in the world and answer the questions related to various aspects of the world whether it could be biological, physical or chemical.
Discoveries in the biological world date back in B.C when Aristotle for the first time divided the living world from the non-living world and classified the living organisms on the basis of the color of the blood.
Thus, the scientific method is the correct answer.