We chose a blueprint of a castle because it's the skeleton/structure of the castle (cell).

We chose the king and queen as the nucleus because they are the main source in the castle.

We chose knights because they all have to work together to get a certain goal (organelles link together to form proteins).

We chose a mail room because it packages and transports mail from a castle to a different place.

We chose a kitchen in a castle because it helps produce food (proteins and lipids).

We chose a dungeon because they isolate people (molecules).

We chose a water mill because it generates energy for the castle (cell).

We chose a storage room because it stores items (materials).

We chose an organic composts because they recycle scraps of food into dirt and we reuse it to make food.

We chose stairs because it divides the upper floor and the bottom floor.

We chose a castle wall because it protects the inner part of the castle (cell).

We chose a servant because they carry out work in order to keep the castle together.