<u>d) observing how the heart contracts to pump blood
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I think its mandatory becuase at our age, we're going through hormonal changes and hella body changes. We're gaining weight, losing it and staying fit and healthy is mandatory to be able to maintain that. By gaining too much weight at a young age, you can cause many future health problems. don't get me wrong, every body is beautiful and everyone was born different but we just need that little bit of exercise to keep our blood pumping and keep up healthy.
Hey there!
The answer would be what to do if someone falls overboard. Finding food is not that hard on a ship and probably not important. Washing the ship Hull is not for the passengers. Navigation lights is for the driver of the boat to use. If someone falls overboard, they could drown if they don’t know how to swim. This is very dangerous.
Answer:
Explanation:
The digestive tract is also called the gastrointestinal (GI) tract or the alimentary canal. It is a continuous tube running from the mouth to the anus.