What happens during the embryonic stage of prenatal development?
The fetus kicks, turns, hiccups, sucks its thumb, and breathes amniotic fluid.
The zygote divides and forms the blastocyst, which implants in the uterus and begins forming the amnion, placenta, and umbilical cord.
Vernix and lanugo develop on the skin to protect against the amniotic fluid.
The arms and legs develop, then fingers and toes.
The arms and legs develop, then fingers and toes.
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During middle adulthood, which of the following are factors related to sleep disturbances and sleep disorders?
a. obesity, cardiovascular disease, and depression b. arthritis, jaundice, and diabetes c. restless legs syndrome, myopic vision, and hypertension d. anxiety, eczema, and psoriasis
An infant who has finally learned to pick up all common types of spoons smoothly and easily and understands the functions of a spoon has attained what Piaget referred to as ________________
a. coordinating secondary circular reactions b. cognitive equilibrium c. mental representations d. accommodation