What happens to large molecules such as antibiotics and hormones in a livestock animal’s body?

a. they do not break down completely, and thus enter the waste. they do not break down completely, and thus enter the waste.
b. they break down into elements such as nitrogen, phosphorus, and potassium.
c. they break down into elements such as nitrogen, phosphorus, and potassium.
d. they are used up in the animal’s body and become part of its flesh.
e. they are used up in the animal’s body and become part of its flesh.