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what grade are you in so i can help
The correct answer is the first choice
I THINK THE BUILDING IS 6X TALLER THAN A PERSON
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C.H. Weaver M.D. updated 10/2020 What is the Carcinogenicity antigen (CEA)? CEA is an antigen (small protein) that is found on the surface of many types of cancer cells and high levels of CEA can be detected in the blood of some patients with cancer and the developing fetus.
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