Answer:
A scientist
Step-by-step explanation:
A scientist is a person that is has vast knowledge in the natural or physical sciences, who explores the natural world in search of knowledge in an organised form in order to contribute to the knowledge bank of the world, which in turn serve as benefits to improving the life on earth. A scientist could be a biologist, anthopologist, anatomist, geologist, chemist, engineer etc. They help in bringing change in their various field to benefit mankind and the environment.