yes, it is zoology. it is the hardest to find for college in the U.S. too.
The hardest substance in a rock would be the hardest mineral of which the rock is composed.
The third hardest gemstone is ruby and then the fourth hardest is emerald.
plant cells
The hardest substance that is naturally occurring is a diamond. However, there are harder substances that have been made by scientists in labs.
you
The hardest toy to find is a special attack infinity dragonoid.
the hardest Pokemon to find is regigigas you can only get him after finding all the other Pokemon and you can find him in the hippodow temple
latias
No.
feebas
The hardest drink for any given person to make is the one with the hardest to obtain ingredients. If something is hard to find it is hard to put it in a drink.
Mesprit & Cresselia (legendary)
human interaction
the one that doesn't exist
Play it and you will find out you can
There is no such thing as a hardest fraction. Something which you find hard someone else may find easy and something which that person find hard some third person might find easy and so on.