How is race a culturally constructed category and not a biological one?

Six amino acids have side chains that are polar but not charged. these are serine (ser), threonine (thr), cysteine (cys), asparagine (asn), glutamine (gln), and tyrosine (tyr). these amino acids are usually found at the surface of proteins, as discussed in the proteins 2 module.

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Not sure if you have any answer choices to pick. however i'd say its the intertidal zone