Well As the ambulance gets closer, the sound waves are compressed relative to the person; so the frequency increases.
D: fronds
hope this helps!
Ans B. Ecological proct that starts at the top of the food chain and tumbles down to the bottom of the food chain.
I would say d,c sorry if im wrong
The Ptolemaic system was a geocentric system that postulated that the apparently irregular paths of the Sun, Moon, and planets were actually a combination of several regular circular motions seen in perspective from a stationary Earth.