Answer:
to compare a sewer overflow withthe human body, a buch of sickle cells can clog the blood stream and may cause the stream to break, and with the overflow a lot of water is in the sewer so the water push out to make it spit out the sewer pipes.
The heart is strengthend through cardiovascular exercise.
Answer:
what exactly do you want explained? I'd love to help! but I'm a bit confused :/ could you clarify?
Answer:
the answers are the first one and the third one
