What is the purpose of the outer shell of the blastocyst?
A. It differentiates into the heart, brain, and spinal cord.
B. It differentiates to form the placenta, umbilical cord, and amniotic sac.
C. It forms the arms and legs of the embryo.
D. It forms the genitals of the embryo.
Answer: B
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A. Systole B. Blood pressure C. Diastole D. Conduction
What type of reinforcers do not provide immediate pleasure?
a. Primary c. Secondary b. Primary prime d. Tertiary
With respect to weight, if current trends hold, the American adult will average a ____
a. gain of five to ten pounds per year b. gain of one to two pounds per year c. loss of one to two pounds per year d. gain one pound per month e. loss of five pounds over ten years
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