D. T cells attack antigens on foreign substances and B cells produce antibodies.
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Sorry I didn't understand the question
Uhh where’s the context i don’t understand how you want me to answer your question
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Threshing may be done by beating the grain using a flail on a threshing floor. Another traditional method of threshing is to make donkeys or oxen walk in circles on the grain on a hard surface. A modern version of this in some areas is to spread the grain on the surface of a country road so the grain may be threshed by the wheels of passing vehicles.
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