A condition that involves an underdevelopment of part of the eye and is often associated with other neurological conditions, such as cerebral palsy, is
A) retinopathy of prematurity.
B) optic nerve hypoplasia.
C) fetal alcohol syndrome.
D) cortical visual impairment.
B
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In a study on the math achievement of two groups of sixth-grade students, it was found that children who had siblings had higher math achievement than children who did not have siblings. This is an example of which type of research design?
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