Jack and Jill are twins. Because he is a boy, Jack's parents encourage him to run. However, they discourage Jill from engaging in athletic activity. As a result, Jack is much faster at running up a hill than Jill. The difference in Jack and Jill's behavior is best explained by

a. nonshared environmental influences.
b. active gene-environment relations

c. polygenetic effects.
d. niche-picking.

Psychology

Discontinuous change focuses on one level building on the previous level

Indicate whether the statement is true or false

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Psychology

Depolarization of the muscle fiber opens voltage-gated ______ channels, which trigger contractions

a. Ca2+ b. Na+ c. K+ d. Cl-

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Psychology