Thestage occurs before mitosis. In this stage extra sub-cellular structures are produced.

Why is it important to reduce the number of chromosomes in half when forming gametes for sexual reproduction?

If scientists are wrong about earth's age based on radioactive material and the decay rates are really much faster, how would nuclear power plants be affected?

Of seawater increases with decrease in the temperature. therefore, the cold water sinks to the deeper layers at the bottom