Studies that estimate the heritability of a trait by breeding animals with other animals that have the same trait are called ______ studies

A three-month old baby named Bryan smiles even when he is alone. Scientific research has suggested that his smile should be attributed to _____

A) effective training by his mom B) his motivation to learn something new C) the reinforcements from his immediate surroundings D) his innate motor programs from birth

The __________ plays a critical role in the rate of physical growth

A) pituitary gland B) hippocampus C) reticular formation D) corpus callosum