Blood pressure peaks when the heart contracts, pumping blood into the arteries and causing them to stretch - this is called the pressure. blood pressure is at its lowest when the heart relaxes, called the pressure. a "normal" blood pressure for a young adult is said to be 120/80, and these numbers represent these two different pressures.

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Im not sure if you still need this but the answer is 300 hz450 hz  i just did this lesson so , wish you the best of luck and take care

False because when you are going on any water activities it is good to know if the water has any recreational illnesses its false on edgenuity also