Why we don't use methylene blue or crystal violet instead of leishman stain? What is the difference between leishman stain and crystal violet?

What type of cell is produced after fertilization occurs and the gametes combines ?

Aflashlight battery is an example of a) potential energy b) kinetic energy c) thermal energy d) solar energy

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?