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What change, if any, should be made to the following sentence: "The shell, which has two parts, the carapace or upper part and the plastron or bottom part, serve both as the turtle's home and its armor."
a) Change "has" to "have"
b) Change "serve" to "serves"
c) Change "serve" to "served"
d) No change should be made.
What is "Change serve to serves"?