Evolution of the atmosphere<span>, </span><span>the development of </span>Earth<span>’s </span>atmosphere<span> across </span>geologic time<span>. The process by which the current atmosphere arose from earlier conditions is complex; however, evidence related to the evolution of Earth’s atmosphere, though indirect, is abundant. Ancient sediments and rocks record past changes in atmospheric composition due to chemical reactions with Earth’s crust and, in particular, to biochemical processes associated with life.</span>
The passes food through the esophagus, the stomach partially digests food, and the large intestine (and the rectum) stores undigested waste.
B. I think, because they are both mechanical. Don't quote me on that <span />
<span>A symbiotic relationship in which one organism lives inside the other and both organisms benefit is the correct answer </span>