Brandon's teeth are stained from his constant coffee drinking, so his dentist recommended that he switch to a new electric toothbrush that not only brushes teeth very rapidly, but also uses sound to reduce plaque and staining. What kind of sound is most likely generated by Brandon's new toothbrush?

Genes contain instructions for making DNA

Indicate whether this statement is true or false.

Mobombi had completed about a quarter of the distance in the marathon in which he was a participant. Suddenly, he stumbled and fell. Despite feeling a sharp pain initially, he got up and continued to run until he completed the race

Upon crossing the finish line he fell down writhing in pain. When checked out, it was discovered that Mobombi had broken his leg. He was able to run the remainder of the marathon relatively pain free due to the release of A) enzymes. B) amino acids. C) monoamines. D) endorphins.