Answer: It has been criticized as being too restrictive by setting a zero level of risk. In fact, it applies only to approximately 400 of the 2,700 substances intentionally added to foods, many of which are GRAS.
Explanation:
Walking is a type of cardiovascular exercise because it builds stamina in your body and also increases the efficiency of your heart and lungs.
The answer is viruses change their form when the immune system knows how to kill it and thats how they trick the immune system and viruses are much smaller than bacterias
