Give examples of other amino acids that serve as precursor and state for what?

Which of these best describes the scientific process

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?