Why do
.
what is essential to become a set
successful adult?​

health and healthy behaviors; taking care of one's self. maturity. an absence of problems. having good friends.

Explanation: We all need a set of core life skills (or, adult capabilities) to manage work, family, and relationships successfully. These skills include planning, focus, self-control, awareness, and flexibility. No one is born with these skills, but we can all learn them over time.

answer; researchers typically cannot control people's sexual behaviors as would be necessary in an experiment;