variable shapes and variable volumes
Our bodies sweat to cool us off and to avoid overheating. Therefore, I think the answer would be "liquid (sweat) sitting on the skin's surface" because sweat has been produced and is sitting to cool the skin. The other options seem to be either after the sweating occurs or interrupts the process of cooling. The third option is my best, process-of-elimination guess. Hope this helps.
Answer:
Because they wanted something harder than paper/cardboard and softer than metal
Your answer would be A. The two main parts the inside of a eukaryotic cell is divided into are the nucleus and cytoplasm.