Because since their ancestors came before them then they inherit certain beneficial traits that help them survive. Those traits are in the DNA and the animals are evolving to be more fit for the environment that they are in. (hope this helps)
The ocean since erosion gets minerials from one place to another the ocean is the reason of the formation since the ocean is the only thing that could form its because of the waves
Which foramen? The human body has several. A foramen is an opening. If something is flowing through the foramen, the narrowing of a foramen will either restrict the rate of flow of whatever substance was normally travelling through the opening, or the pressure needed to maintain the rate of flow will increase.
