The brain-imaging method that uses multiple X-rays to generate a picture of a horizontal slice of the brain is

Auditory impairment, which is a special need that involves the loss of hearing or some aspect of hearing, affects __________ percent of the school-age population

a) 1–2 b) 2–4 c) 4–6 d) 6–8

The manifestation of complex human traits is known as a __________

Fill in the blank(s) with the appropriate word(s).