Earth does have an elliptical orbit, but the path is nearly circular based on the distances given. The model shows that Earth’s axis is tilted. During summer in the Northern Hemisphere, the hemisphere tilts toward the Sun. The Southern Hemisphere experiences winter at that time, because it points away from the Sun.
Waves deposit fine sediments from weathered coastal rocks on the shore.
Artificial selection is one very expensive but can also create mutations that we don’t want. Some harmful to us and the animal. Artificial selection can also change the life span of the animal to a much shorter one