To test for hydrogen, burn a candle near the suspected source of hydrogen. If you hear a squeaky pop sound, hydrogen is present because when hydrogen gas burns, it makes a squeaky pop sound.
THE LIVING AND NON-LIVING THINGS ARE INTERDEPENDENT IN EACH OTHER............EVERY THINGS IN THE UNIVERSE IS IMPORTANT.....FOR EXAMPLE, THE RAW MATERIALS THAT ARE AVAILABLE ON THE SURFACE OF THE EARTH IS FINALLY CONVERTED INTPO THE USABLEPRODUCTS IR THE FINISHED GOODS.....THUS, THEY BOTH ARE EQUALLY IMPORTANT IN THIS UNIVERSE
The answer would be D.) Genetic Engineering