Answer: A, through extensive testing and the accumulation of several lines of evidence
Explanation:
The waxy secretion is earwax
Answer:
There are three amino acids that have basic side chains at neutral pH. These are arginine (Arg), lysine (Lys), and histidine (His). Their side chains contain nitrogen and resemble ammonia, which is a base. Their pKa's are high enough that they tend to bind protons, gaining a positive charge in the process.
Explanation:
Mark as brainliest