Final answer:
A critical thinker is someone who can identify and solve problems by gathering information, analyzing evidence, and using a systematic approach. It also involves using the scientific method.
Step-by-step explanation:
A critical thinker can be defined as someone who has the ability to identify and solve problems by gathering information, analyzing and evaluating evidence, and forming a judgment based on reasoning and logic. Critical thinking involves using a systematic approach to work through and solve problems, rather than relying on personal opinions or assumptions. It also involves using the scientific method, which is a structured process for conducting research and finding solutions to problems.