Answer:
An alicyclic compound contains one or more all-carbon rings which may be either saturated or unsaturated, but do not have aromatic character. Alicyclic compounds may have one or more aliphatic side chains attached...hope this helps :)
Not defined because of the vertical line.
Answer:
The Earth
Explanation:
Before scientists realized that we orbited around the Sun, humans believed that the solar system revolved around Earth.
A. Dam
All of the others are naturally formed, whereas a dam is manmade
(unless it's a beaver dam of course)