Role of organs in excretion other than kidney

Bored anyone comment plz​

All cells are made of four types of acids, lipids, proteins, and carbohydrates.

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

Astudent conducts an experiment to determine how the amount of water given to a plant affects its growth. what is the independent variable for this experiment?