Which of the following statements is false?
a. Individuals are injected with antibodies to
produce passive immunity.
b. A genetically engineered virus is not as
potentially dangerous as a weakened but intact
pathogen.
c. Allergies occur when the body makes a strong
immune response to a normally harmless
substance.
d. Allergies are a nuisance but are never dangerous
or life threatening.
e. An allergic response includes the secretion of
mucus, prostaglandins, and histamines.
Answer: d
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A) simple, but not compound, eyes B) two pairs of antennae C) a head, thorax, and abdomen D) tracheae and spiracles
The average number of sperm that enter the
vagina during an ejaculation is between
a. 150,000 and 350,000. b. 1.5 and 3.5 million. c. 15 and 35 million. d. 150 and 350 million. e. 1.5 and 3.5 billion
Explain what is meant by the rain shadow effect.
What will be an ideal response?
The total number of existing cases of disease within a defined population is the _________.
A) incidence B) prevalence