Final answer:
The meat system requires less land and water than crops, but reusing by-products and the use of hormones can have consequences for humans and the environment. The correct answer is option b. and c.
Step-by-step explanation:
In most cases, the meat system requires less land and water than crops. While it is true that growing vegetables requires less energy than raising animals for meat, the land and water use are generally higher for crops. On the other hand, the reusing of by-products and the use of hormones in the meat system can have consequences for humans and the environment. Therefore, options a and d are not accurate.