Which is the best definition of adoption? legally agreeing to carry a pregnancy created by sperm from the male partner of a couple legally agreeing to carry a pregnancy created by the egg and sperm of another couple legally transferring parental rights to a child from the biological parents to another set of parents

Adoption is legally transferring parental rights to a child from the biological parents to another set of parents.

People who utilizes the progression principle will ensure their exercise program increases in frequency, intensity, time, and type. the changes need to happen gradually in order to ensure they make gains in their fitness program. a person who doesn't utilize the progression principle can still gain health benefits from exercising, but will not continue to improve in cardiovascular fitness.