Question

1. how many amino acids are required to sustain human life? 5 9 15 18 20

Explanation:

Essential amino acids are those the human body cannot synthesize and must obtain from diet. There are 9 essential amino acids required to sustain human life. The other options (5, 15, 18, 20) do not match the known number of essential amino acids for humans.

Answer:

B. 9 (assuming the option with 9 is labeled as, for example, B; if the original options had labels like A:5, B:9, C:15, D:18, E:20, then the answer is B. 9)