One of the three major concerns of developmental psychology involves a focus on

1. Nature and nurture.

2. Continuity and stages.

3. Stability and change.

Explanation:

Developmental psychology is the scientific study of how and why human beings change over the course of their life.  Developmental psychology currently focuses in the entire human being lifespan.

Developmental psychology examines our physical, cognitive, and social development and it focuses on three major issues:

So, the question is asking for one of the three major concerns of developmental psychology but since there are no options given, I've given you the three major concerns which developmental psychology focuses in.

using the scientific method.

the federal government of the united states was established by the constitution. us is a presidential republic. the president is head of state, head of government and of a two party legislative and electoral system. the supreme court balances the powers of the federal and the state government. yhe executive branch is headed by the oresident. there are two chambers of congress, the senate and the house of representatives. judicial power is exercised by the judicial branch (or judiciary), comprised of the supreme court and lower federal courts. the judiciary's function is to interpret the   constitution as well as the federal laws and regulations.