(C) $-$ Zwitterions,such as amino acids at physiological $pH$,have both a positive amino group $(-NH_3^+)$ and a negative carboxyl group $(-COO^-)$.$-

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(C) $-$ Zwitterions,such as amino acids at physiological $pH$,have both a positive amino group $(-NH_3^+)$ and a negative carboxyl group $(-COO^-)$.$-$ This makes them molecules with opposite polarity charges.$-$ Cations and anions only have one type of charge.