I believe the answer is A. True.
The answer is C. The energy of the acacia tree is passed on to the impala.
Environmental manipulation of a crop can not only have unexpected consequences, but also have a negative impact on the atmosphere as well. The crops produced might be of inferior quality than expected. The amount of crop that grows can also be less. More water might be needed for the crops to grow.
What grade are you in if you are in 5th or 6th i can help you