Which material, found in the digestive system, aids digestion and also kills pathogens? mucous membranes stomach acids saturated fats complex carbohydrate

The material found in the digestive system that aids in digestion and also kills pathogens would be "stomach acids", specifically hydrochloric acid.

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ia. mver.y..sor .r..yinee..i am.ina.rush.pleas eforg.ive   meiknowiama. nas.s holei apalo.gize