Which one of the following minerals found in amino acids stabilize the three-dimensional shapes of proteins such as those in skin, hair, and nails?

Chris would like to conduct a study on the effectiveness of a new substance-abuse treatment program. he has a sample of participants go through the program and he uses as a comparison group people who did not volunteer for the program but were eligible. chris has used a(n) design for his study.

When does a metropolitan area become a megalopolis?

3. define historiography. has historiography changed over time or stayed the same? why is this distinction important? use complete sentences for your response. (4 points)