Answer: "control group" .
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Answer:
all living organisms need air , water, food
the air enters throught nasal cavity or through the mouth , and quickly moves to the pharynx, it passes the larynx or box voice and enters the trachea
trachea contains rings of cartilage that helps produce sounds
the trachea
rings of cartilage
<span>according to overlapping-waves t</span><span>heory, when given challenging problems, children try out various strategies and observe which work best, which work less well, and which are ineffective.
Overlapping-waves theory made the assumption that after doing the same thing over and over again, people will find a unique and personal way to achieve the completion of that task which give them the most efficiency. This occurrence led to the formation of expertise in most people.</span>
