Answer:
Historically, buttresses have been used to strengthen large walls or buildings such as churches. Flying buttresses consist of an inclined beam carried on a half arch that projects from the walls of a structure to a pier which supports the weight and horizontal thrust of a roof, dome or vault.
Explanation:
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I believe the correct answer is: a. Control of Phonation.
"Raspberries" are examples of sounds made in the control
of phonation stage of child’s language development. The control of phonation
stage (from 1 to 4 months old) is when the lips and tongue become more
coordinated with phonation, and child begins to say consonant-like sounds,
although these are not yet fully formed.
