In vertebrates, cells of the neural crest develop into ____
a. bones of inner ear only
b. cartilage of the face only
c. cranial nerves only
d. muscles of the chest and cranial nerves
e. bones of the inner ear, cartilage of the face, and cranial nerves
ANSWER: e
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Communicable diseases are most easily transmitted during the:
A) incubation period. B) period of convalescence. C) period of illness. D) prodromal period.
The only taxonomic category in which evolution can occur is the
a. genus. b. species. c. kingdom. d. family. e. class.
The ________ zone of an open-water lake receives enough light to support photosynthesis
Fill in the blank(s) with correct word
The leading cause of extinction by human activities worldwide is
A) habitat fragmentation. B) predation. C) pollution. D) invasive species. E) overexploitation.