As a child, you contracted hand, foot, and mouth disease, which is caused by a virus. several years later, your sibling also contracted the same virus. why don't you get sick a second time?

you have antibodies that already recognize the virus.
white blood cells released histamines and killed the virus.
your skin prevented the virus from entering your body.
stomach acid inactivated the virus, preventing its spread.

the oceanic zone is typically defined as the area of the ocean lying beyond the continental shelf, but operationally is often referred to as beginning where the water depths drop to below 100 meters (328 feet), seaward from the coast to the open ocean.

explanation:

you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.