By studying several things, mostly meteorites, and using radioactive dating techniques, specifically looking at daughter isotopes, scientists have determined that the Solar System is 4.6 billion years old. Well, give or take a few million years. That age can be extended to most of the objects and material in the Solar System.
A) A family psychologist would help deal with developmental and behavioral problems in children and teenagers. They would also explain to parents how to help at home to change behavioral problems.
