Identify a signal the brain sends out after the nervous system sends the signal that pH has dropped.

All but one describes an effect of aging on the digestive system. a) decreased acid secretion b) decreased elasticity of stomach c) capacity to resist damage decreases d) food remains in stomach for less time

Hybrid instruments that play sounds that are part sampled and part synthesized are known as:

Which of the following is a true statements about viruses? viruses have no nucleus. viruses are alive. viruses have a cell membrane. all viruses are deadly.