Answer:
A. In fact, elephants place such huge demands on their own environment, that in order to survive, they often come into conflict, with humans, who are competing for the same resources.
Explanation:
I think this is the answer. The sentence before states that elephants devour several hundred pounds of plant matter in a single day, so this is why i would say "in fact". I'm sorry if this is the wrong answer!

The harmonic frequency refers to the resonant frequency that is an integral multiple of the fundamental frequency, harmonics are usually simple sinusoidal oscillation at a single frequency. where as Resonance frequency are frequencies that are not necessarily sinosudal or integral multiple of fundamental frequency and it may have complex oscillations made up of multiple harmonics ~
It's like if you play a piano with a single key, it will show harmonic frequency, but if you use multiple keys at a time it may show Resonance.
Answer:
Explanation:
. this is long, but im guessing A for part c and a for part. by the way i said im not that sure though