As people age,
the skin gains fat.
there is less collagen and elastin in the skin.
skin cells are replaced much more quickly.
there is more collagen and elastin in the skin.

What is the american psychological association’s ethical principle of psychologists and code of conduct based upon? a. the work of a dozen world-renowned philosophers and ethical savants. b. the feedback of thousands of psychologists and their ethical struggles. c. the regulatory power and authority of the united states constitution. d. the hippocratic rules and guidelines of medical practitioners and surgeons. select the best answer from the choices provided a b c