Pls help me pls idk how to do this

Cycle: A repeated pattern, The sun: The orgin for the water cycle, The water cycle: The process by which water circulates between the oceans, atmosphere, and land, Evaporation: The sun heats up water and turns it into vapor, Condensation: Water vapor in the air that gets cold and turns into water, Percipitation: water that falls in the form of snow, rain or hail.

answer; ///(b) it is composed of four protein chains and four heme groups;

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: