In an oil spill why does the oil not mixed with the seawater

{answer found. it's (3 ) }which statement describes the cell cycle? (1)the cell cycle is a process in which one cell divides into four genetically different cells. (2)the cell cycle is a process in which one cell divides into two genetically different cells. (3)the cell cycle is a process in which one cell divides into two genetically identical cells. (4)the cell cycle is a process in which one cell divides into four genetically identical cells.

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

What if the yeast were extremely active and produced more than 100ml gas. would you know? why/why not