should humans use synthetic materials thta have natural material that is the same chemically. this is for science btw Please answer ASAP

Asample of the male sex hormone testosterone, c19h28o2, contains 3.88×10^21 atoms of hydrogen.(a) how many atoms of carbon does it contain? (b) how many molecules of testosterone does it contain? (c) how many moles of testosterone does it contain? (d) what is the mass of this sample in grams?

Compare and contrast refraction of light and sound will give brainliest

The same side of the moon always faces earth because the