Superior and middle nasal conchae formed from its projections in

The correct answer is: ethmoid.

Explanation:

The ethmoid is a bone that is located in the anterior part of the skull ("at the front"), between the eyes, separating the brain from the nasal cavity.

The ethmoid has 3 parts: the cribriform plate, the ethmoidal labyrinth, and the perpendicular plate. The superior and middle nasal conchae are part of the ethmoidal labyrinth.

In the conchae resides most of the mucosal tissue necessary for respiration, which also provides the humidity required for olfaction, and also plays a part in the first line response of the immune system.

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it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added