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miss Akunina [59]
3 years ago
9

A/an is a protein or carbohydrate chain which serves as a marker and helps the immune system to identify cells as self or foreig

n
Biology
1 answer:
elixir [45]3 years ago
4 0
I donot know but i think it is white blood cell
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3 years ago
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A all of the genes found within the ecosystem

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it is

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Read 2 more answers
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