Answer: masculine ego
Explanation:
Men are seen as dominant beings and hence should be strong
Developmental psychology is the scientific study of how individuals evolve from conception to death in both new and familiar ways.
The study of human growth, change, and adaptation over the course of life is known as developmental psychology. The field has grown to include puberty, adult development, aging, and the full lifespan after initially focusing on infants and young children. Understanding how thought, feeling, and behavior evolve throughout life is the goal of developmental psychology. Physical development, cognitive development, and social and emotional development are the three main characteristics that this field looks at when analyzing change. A wide range of subjects are covered in these three dimensions, such as motor abilities, executive functions, moral understanding, language acquisition, social transformation, personality, emotional development, self-concept, and identity construction.
Learn more about Developmental psychology here
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It states that when you discover something new you will most certainly find something that is more advanced than it. Which comes from humans instinct of curiosity
The answer C looks the best to me. It states the fact that it allowed them to practically DOUBLE their land, and it lead to much westward expansion, which later lead to the gold rush, and other important things to America.