20. Which statement correctly categorizes hog operations? O A. Feeder operations raise hogs throughout their lifetime, farrow-to-finish operations raise young hogs, and finisher operations raise older hogs

O B. Feeder operations raise hogs throughout their lifetime, finisher operations raise young hogs, and farrow-to-finish operations raise older hogs

O C. Finisher operations raise hogs throughout their lifetime, feeder operations raise young hogs, and farrow-to-finish operations raise older hogs.

O D. Farrow-to-finish operations raise hogs throughout their lifetime, feeder operations raise young hogs, and finisher operations raise older hogs

D. Farrow-to-finish operations raise hogs throughout their lifetime, feeder operations raise young hogs, and finisher operations raise older hogs

Explanation:

Hog farms operate in three different categories:

Farrow-to-finish: This involves breeding sows to produce offspring.  The offspring's are then fed until they are have reached the size for slaughter. The entire process takes throughout the hogs lifetime.

Feeder operations: This involves breeding sows and then selling their piglets to other farmers who will then raise them for till they are matured for slaughters. This process is just to raise young hogs.  

Finisher operations: This involves buying piglets from other farmers and then raising them until they are matured for slaughter. This finisher operations raise older hogs

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."