Identify the three parts that create an amino acid

What is histamine and what is its role in allergic reactions

According the inverse square law, doubling the distance from the source of the sound, a speaker, for example, will drop the sound 6 db each time. if you were standing in the back of an auditorium, 32 feet away from a speaker not using any amplification, would you be able to hear a speaker clearly? why or why not?

Nucleic acids offer variability because they contain alternate forms of genes called .