The site of protein synthesis in an animal cell is

Ribosome is the main site of protein syntesis in an animal cell and thats why it is also called protein

factory.

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.