Vincent believes that gender roles are determined by how an organism changes and adapts itself to the environment. He proposes that an organism's role in sexual selection and its reaction to selection pressures determines the gender differences among organisms. In this case, Vincent is proposing the approach to gender

evolutionary psychology                  

Explanation:

Evolutionary psychology: The term "evolutionary psychology" is described as one of the "theoretical approaches" related to psychology that generally aims or is focused on explaining beneficial psychological and mental traits, for example, language, memory, or perception, etc as adaptations i.e are considered as the "functional products" associated with natural selection.

In the question above, the given statement signifies the evolutionary psychologists.

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.