Answer:Marine regression is a geological process occurring when areas of submerged seafloor are exposed above the sea level. The opposite event, marine transgression, occurs when flooding from the sea covers previously exposed land.
Explanation:
Differences between<span> a </span>physical and chemical change<span> in matter or substances</span>
A CELL WALL because the other three appear in different types of cells
natural selection is an species wich are adapted to their environment