Some statements about crystals are given below: [P] The crystal lattice is constructed from repeating units called unit cells. [Q] The external appearance of a crystal is described by crystal habits, such as needles, prisms, rosettes etc. [R] Polymorphism is the ability of a compound to crystallize as more than one distinct crystalline species with different internal lattice. [S] Hydrates are always more soluble than anhydrous form of the same drug Choose the corrected combination of statements about crystals.