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Luden [163]
4 years ago
11

The sphincter is a _____ of muscle at an opening.

Biology
2 answers:
joja [24]4 years ago
8 0

Answer:

ring

Explanation:

ri

The sphincter is a ring of muscle surrounding and serving to guard or close an opening or tube

Rudik [331]4 years ago
8 0
The answer to this is C.ring
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