Let's analyze the given statements and the conclusions:
Given statement
All omnivores are herbivores.
No herbivores are carnivores.
Some carnivores are humans.
Conclusion:
I. Some humans are carnivores. This is true based on the third statement, which explicitly says some carnivores are humans.
II. No carnivores are omnivores. This is true because all omnivores are herbivores, and no herbivores are carnivores (as per the second statement).
III. Some omnivores are carnivores. This is false because no herbivores (and hence no omnivores, since they are herbivores) can be carnivores, according to the second statement.