The mouth is the beginning of the digestive tract; and, in fact, digestive starts here when taking the first bite of food
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It’s A the immune system & lymphatic Hope this helps!
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D. The umbilicus is caudal to the chin
The terms caudal and inferior are synonymous, meaning "away from the head end or toward the lower part of a structure or the body; below." The umbilicus is caudal (inferior) to the chin.
