Final answer:
Manure can get into the meat at slaughterhouses and hamburger grinders due to unsanitary conditions and practices. Workers can contaminate the meat by putting meat dropped on the floor back into processing and potentially bringing in manure from their shoes. Additionally, the waste from animals is often discarded into the environment, contaminating water sources used in meat processing.
Step-by-step explanation:
The manure can get into the meat at slaughterhouses and hamburger grinders due to the unsanitary conditions and practices. Workers may put meat that was dropped on the floor back into processing, contaminating it with dirt and potentially manure from their shoes. Additionally, the waste from cows, sheep, and pigs, including manure, blood, and unused organs, is often discarded into the environment and can contaminate the water sources used in the meat processing.