The branch of psychology that systematically focuses on the physical, mental and social changes that occur throughout the life cycle is called

Developmental psychology.

Explanation:

The branch of psychology that systematically focuses on the physical, mental and social changes that occur throughout the life cycle is called developmental psychology.

Basically, developmental psychology is a scientific study or social process that is aimed at understanding how and why living organisms such as humans experience various change throughout their life cycle or over the course of growth.

Hence, a developmental psychologist is saddled with the responsibility of providing cogent reasons or explanations as to why behavioral changes, feelings or emotions, thinking, growth and physical factors affect human beings over the course of growth.

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