How long is a normal gestation period?
A. 260 days
B. 270 days
C. 280 days
D. 290 days
Answer: C
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Humans belong to groups because they satisfy our needs for
a. affection. c. belonging. b. attention. d. all of these
When Jonathan uses a twisted wire coat hanger to connect a heavy door to the wall so that it doesn't slam shut, he is demonstrating the fact that he is not hindered by _____
Fill in the blank with correct word
A researcher wants to know whether eating chocolate makes people nervous. Some participants are given two bars of chocolate to eat and some are given no chocolate at all, and then all of the participants are tested for nervousness an hour later
In this experiment, the amount of chocolate eaten is the independent variable. Indicate whether this statement is true or false.
Which of the following develops from the embryonic disk?
a. the placenta b. the baby c. the amniotic sac d. the amniotic fluid