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tract
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tract

Chant with penitential words, sung after the Gradual in the Mass in Lent (in place of the Alleluia). Tracts are the only surviving examples in the regular chants of the Mass of ‘direct psalmody’, sung without antiphon or respond. They occur only in modes two and eight, and it is possible that those of mode two were originally Graduals. Their structure is that of a highly elaborated psalm-tone. The number of verses ranges from 2 to 14.



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The successful establishment of protozoa in the termites required them to withstand the chemical and physical conditions inside the alimentary tract, use the gut contents as a food source, cause no damage to the host and be carried through successive stages and generations.
It basically results from a condition called 'diverticulosis' which involves the formation of sacs or vesicles in the lining of the alimentary tract.
Some infections in the alimentary tract can commonly occur in children.
 
 
 
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