Why the polar diameter and the equatorial diameter of the earth are different. Explain briefly in two or three lines ​

Draw the skeletal structures of two different molecules that are each made of 5 carbon atoms and 12 hydrogen atoms.

Calcium chloride +gold(1) oxide—>

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange