______ act as a barrier to invading cells and viruses. muscle cells connective tissue epithelial cells none of the above
1 answer:
Answer:
Epithelial cells
Explanation:
Epithelial cells act as a barrier to invading cells and viruses.
It lines the tissues of blood vessels in order to keep blood flowing and keeping you healthy.
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<em>I think the answer is glucose/sugar</em>
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C. A gen, if present in a pair of alleles, is always expressed
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