Gills are unsuitable for animals living on land because
A) the large external surface area of gills would allow dehydration of the animal.
B) air cannot diffuse across the gill surface.
C) there is no way to get air into the gills.
D) gills require high blood pressure.
Answer: A
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People who carry and may spread pathogenic organisms without any overt symptoms of illness are called
A. primary infections. B. secondary infections. C. mutualists. D. carriers
At the same latitude, a person with dark skin would have which levels of folic acid and vitamin D as compared to a person with light skin?
A. no difference in vitamin D or folic acid B. an increase in both folic acid and vitamin D levels C. a decreased level of folic acid and an increased level of vitamin D D. a decrease in both folic acid and vitamin D levels E. an increased level of folic acid and a decreased level of vitamin D
IgG antibodies cross the placenta and enter the fetus' bloodstream, producing (active/natural/passive) acquired immunity.
Fill in the blank(s) with the appropriate word(s).
True or False: Neutrophils present in higher- than-normal numbers in blood or at a site of inflammation indicate an active response to a current infection
a. TRUE b. FALSE