The purpose of cutting a frog heart it too relate how the heart structure is. It is just a small scale of the human heart.
Polar bears, arctic wolves, snowy owl and a lot more
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D/ Kilograms per cubic-centimeter
Answer:
higher altitudes have a lower level of oxygen which in turn, trains your lungs to hold and breathe more oxygen which also helps you cycle, run, etc. longer than usual
Explanation:
