Answer: They push against each other along a line called a front. When a warm air mass meets a cold air mass, the warm air rises since it is lighter. ... On the other hand, when a cold air mass catches up with a warm air mass, the cold air slides under the warm air and pushes it upward. As it rises, the warm air cools rapidly.
Explanation:
Yes because heart have 4 valves which is tricuspid, bicuspid, pulmonary and aortic. Blood have to flow in one direction.
Answer:
C) Nelson Mandela in South Africa
Explanation:
Mandela led the south african resistance against apartheid, and was imprisoned for life in 1964
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