Cancer
a. is a relatively new disease, first diagnosed during the latter half of the 19th century.
b. is a group of diseases marked by the growth and spread of new cells.
c. is due to a parasite that attacks new cells.
d. is due almost completely to contact with dangerous chemicals.

the ileocecal valve (also called bauhin valve), which limits the rate of food passage into the cecum and may prevent material from returning to the small intestine.

answer:

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explanation:

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