Ghee freezes from bottom but water freezes from top, why?

I presume you mean ghee as in the butter. Seen as ice is one of the many solids to have a lower density than its liquid form, it freezes from the top. Ghee is made from hydrocarbons not dissimilar to petroleum, it shares the same properties as most elements of its solid state (at 1 atmosphere) being at a higher density than its liquid state.

Slime molds are example of protists that can produce energy

Explanation:

Slime molds are known as photosynthetic protist. They can produce their own foods.  Like plants, slime molds also have cellulose in the cell walls of their spores. They are unicellular but they can form colonies.

Hence, it can be said that Slime molds are example of protists that can produce energy