What happens when cells do not
respond to the signals that
normally regulate their growth?

Such cells, called cancer cells, divide uncontrollably and form masses of cells called tumors that can damage the surrounding tissues. ... Normal cells respond by not growing.

Cancer cells do not respond to the signals that regulate the growth of most cells... What happens when cells do not respond to the signals that normally regulate their growth? Such cells, called cancer cells, divide uncontrollably and form masses of cells called tumors that can damage the surrounding tissues.

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i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

the answer to your question is tooth decay.