Antibiotic resistance is a consequence of evolution via natural selection. The antibiotic action is an environmental pressure; those bacteria which have a mutation allowing them to survive will live on to reproduce. They will then pass this trait to their offspring, which will be a fully resistant generation.
More than 3.6 billion years！
Answer: both amino acids
Explanation: amino acids will have the same basic structure at physiological pH levels.
they might conserve water
