In order to study the formation of cancer cells, you should study the life cycle of normal cells as cancer cells are abnormal cells.
Actually, Normal cells grow, divides and died after an interval of time. And when this process is break down, cancer cells begin to form. They are usually old cells which don't die after their life cycle.
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If a pair of Organisms are capable of producing fertile offspring in nature they must belong to the same species
The waxy cuticle is made of A.lipids
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The answer is that the criteria of classification change whith the improved understanding of organisms around us
