The outbreak of measles within the last few years was due to
A. mutation of the virus.
B. change in the environment.
C. a decline in vaccination of children in the previous years.
D. increase in sensitivity of detection techniques.
C
Biology & Microbiology
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Which stage of development results in an early embryo with two or three germ layers?
a. fertilization b. organ formation c. cleavage d. gastrulation
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What gene(s) is/are encoded in the Xic?
A. Xce B. Xist C. Tsix D. Both the Tsix and Xist genes are in the Xic region
Biology & Microbiology
Amebiasis
A. is caused by . B. often causes a bloody diarrhea. C. is an infection of the stomach. D. is restricted to temperate climates. E. is caused by AND often causes a bloody diarrhea.
Biology & Microbiology
Which characteristic of sound waves relates to loudness?
a. amplitude b. frequency c. modulation d. wavelength e. pitch
Biology & Microbiology