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Pre-Test
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1
Which of the following is not considered one of the five key events in embryonic development?
A)Cleavage
B)Metamorphosis
C)Organogenesis
D)Fertilization
E)Neurulation
2
Which of the following represents a major mechanism of cell differentiation?
A)Autonomous specification
B)Conditional specification
C)Invariable specification
D)Autonomous specification and conditional specification
E)Autonomous specification, conditional specification, and invariable specification
3
An embryonic development disorder caused by both genetic and environmental factors is
A)muscular dystrophy.
B)multiple sclerosis.
C)cerebral palsy.
D)cleft palate.
E)spina bifida.





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