The movement of water from ocean to atmosphere, then land and back to the ocean. This whole process forms a cycle called as water cycle.
It assures the movement of water from land to sky and back from the sky to land. The water from the ocean and sea evaporates into the atmosphere and goes into the sky to form clouds.
These clouds causes rain (precipitation) which falls on the land and then the water flows back to the ocean.
it would be Fragilariopsis curta because it is part of the diatom subspecies of algae and has a hard bone like silica shell making it more like a crustacean than a true algae