A producer creates energy, primary consumers eat producers, secondary consumers then eat the primary consumers, and the tertiary consumers eat secondary consumers. Producers produce or create energy using either energy from the sun (photosynthesis) or chemical energy (chemosynthesis).
How to Become a Child Psychologist. A child psychologist has a doctorate degree in psychology (some positions only require a Masters degree), with a special interest in working with children. In graduate school you can get a master's degree (either the Master of Arts or Master of Science degree) in psychology concentrating in child psychology and child development.
Some areas of psychology have no direct training route. For example, to become a child psychologist you might first train as a clinical or counselling psychologist and then specialise in working with children. Or you could train in educational psychology and work with children in education.