A new virus has recently been identified that has been linked to certain birth defects. A pregnant woman is infected with this virus in the fifth month of her pregnancy. However, at birth, the infant shows no signs of the characteristic birth defects. What is the most likely explanation?
A) The virus actually doesn't cause birth defects.
B) The woman was likely infected after the virus' critical period.
C) The woman was actually infected by a different virus.
D) The woman was likely infected during the virus' critical period.
B) The woman was likely infected after the virus' critical period.
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Pheromones are ____ signals
a. tactile b. electrical c. acoustical d. visual e. chemical
Which among the following substances
contaminating the Aberdeen Proving Ground is an organic compound that damages the nervous system, liver, and lungs?
a. lead b. arsenic c. dimethyl chloride d. trichloroethylene e. more than one of these is the answer
The cheesy coating that prevents the fetus' skin from chafing is called
a. vernix caseosa. b. fossa ovalis. c. chorionic villus. d. lanugo. e. colostrum.
The structure where fertilization takes place is the ____
a. ovary b. oviduct c. oviduct d. cervix e. uterus