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nika2105 [10]
3 years ago
7

What substance in the esophagus lining helps make swallowing easier?

Biology
1 answer:
aniked [119]3 years ago
8 0

Answer:

c. mucus

Explanation:

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It is difficult for scientists to classify protists into one kingdom because they closely resemble member of other eukaryotic kingdoms than they do other protists.

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