Add a few drops of glycerine on the slide,it will prevent the slide from drying.
Molting occurs in all animals with exoskeletons, due to the fact that such animals cannot grow bigger than their shell without replacing their shell with a bigger one. That is the general idea
Okay, let's see...
In the center, we have the inner core, then the outer core, and then the slow moving mantle. On the outside, we have the crust a.k.a. where we live. =]