The umbilical cord
A) contains two veins.
B) provides the fetus a cushion against jolts caused by the mother's movements.
C) grows to a length of 1 to 3 feet.
D) develops during the period of the fetus.
C
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How can improvements in health and nutrition change menarche?
a. Improved health and nutrition can lower the age of menarche. b. Improved health and nutrition can increase the age of menarche. c. Worsening health conditions and nutrition can cause an increase in the frequency of menstruation. d. Worsening health conditions and nutrition can prevent fertility.
An epidemiologist is conducting research on patients with the diagnosis
of schizophrenia. The research is designed to determine what problems occur at elevated rates among people with this diagnosis. When the data are analyzed, what will they show occurs at higher rates among people with schizophrenia compared to the general population? a) anorexia b) suicide attempts c) mental retardation d) loss of immunological functioning