What is the origin of most childhood cancers?
a. Placenta
b. Environment
c. Mesodermal germ layer
d. Neural tube
ANS: C
Most childhood cancers originate from the mesodermal germ layer that gives rise to connective tissue, bone, cartilage, muscle, blood, blood vessels, the gonads, the kidney, and the lymphatic system. Most childhood cancers do not originate from the placenta or the environment. Neural tubes are generally not associated with cancer.
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