I believe the answer is A. The R group gives amino acid unique characteristics. Hope this helps :)
Explanation: long-tailed helps a lizard with balance. It provides a fat reserve for the lizard in times of starvation. A lizard uses its tail to communicate its feelings and its social status. Lizards detach their tails as a defense mechanism.
Answer:
well i can help you:)))?)))
External exchange of gases
