"I seek to understand the principles whereby a person's ability to think, speak, perceive, and learn changes as they go through their life span." This statement identifies one as a psychologist.

Developmental Psychologist

Explanation:

Developmental psychology is the scientific study of the change and development of human beings over the course of their life.

Developmental psychologists aims consistently at how thoughts emotional feelings and behaviour can change throughout a person's life time using a number of theories to study about different aspects of human development based on the theory that proposes that each child goes through a number of stages of changes and develooment throughout this / her lifespan.

Developmental psycholgists emphasizes on how an early life experience can have consequences at later stages by providing information on what children know and understand and suggests how they are more likely to behave and therefore gives insights on how to raise children.

answer; i believe the answer is 80%, plz check first good luck;

no because it could make the world a terrible place to live in.