I’m pretty sure this is how you want it answered...
1. D
2. A
3. B
All of the above.
The main greenhouse gases are: methane, carbon dioxide, chlorofluorocarbons, ozone, nitrous oxides and water vapor.
I'm 80% sure that the answer is John B. Watson.
Both being ɑ-amino acids, alanine and serine each have an amino (–NH2) and a carboxyl (–C(=O)OH) functional group. The amino group of one amino acid and the carboxyl group of the other amino acid can react in a condensation reaction to form a covalent peptide bond. The resulting molecule would be a dipeptide.