The extra 21st chromosome that causes Down syndrome is
a. usually provided by the egg.
b. usually provided by the sperm.
c. provided by the egg about half the time and by the sperm about half the time.
d. usually created sometime during prenatal development.
a
Psychology
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Babies become attached to their mothers because their mothers provide them with food and warmth
Indicate whether this statement is true or false.
Psychology
The stage of cognitive development in which children understand the world through their senses and their actions on the environment is called
A) preoperational thought. B) formal operations. C) concrete operations. D) sensorimotor.
Psychology