One of Freud's major contributions was . a. his belief that the first years of life help to shape personality. b. his belief that learning and mental expectancies lead to fixations. c. his belief that children don't have a conscience. d. the scientific basis of his theory that allowed predictions of future behavior.

d. the scientific basis of his theory that allowed predictions of future behavior.

Explanation:

Freud as a renowed neurologist and who is perhaps most known as the founder of psychoanalysis was a great social scientist over the past few decades.

His study on emotional disorder known as hysteria helped him to discover the relationship between the symptoms and the traumatic experience which the patient passes through.

This observation had lead him to a major contibution in the scientific community with his theory used to predict future behaviour to be exhibited by an individual.

the united states has a federal government. the president is the head of the federal government of the united states. however, each state forms its government for administration purposes. the powers of the state governments are exercised within restricted state boundaries. and citizens participate in this government by voting.

i believe your answer is mountains.