How many oxygen molecules are inside and outside of the cell at equilibrium?

Ageologist determines that a sample of a mineral cant be scratched by a steel nail but can be scratched by a masonry drill bit based on this information the sample mineral has to be softer than

Plz will mark! the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Aboy jumps into a cold swimming pool and his body tempature goes down hus muscles ,blood vessels