Answer:
The balance of nature is when all things are in line and can survive on it's own, however when us humans come over and intentionally take something out of this balance it makes the balance harder to survive on it's own.
Step-by-step explanation:
An example is that if people start eating more of a certain type of animal, their balance can start to be affected because the other animals that also eat off of that animal will now start to suffer because of the lack of their food.