both refer to movie chains (i.e., Loews, AMC Theatres) with movie theatres that screen more than one film at a time, as opposed to single-screen theatres. A multiplex has from 2 up to 16 screens, a megaplex has 16 or more screens; plex is the abbreviation for a multiplex theatre.
A morula (Latin, morus: mulberry) is an early stage embryo consisting of cells (called blastomeres) in a solid ball contained within the zona pellucida.
Lingula is a genus of brachiopods in the class Lingulata. Lingula is known to have existed since the early Ordovician period. Lingula is a good example of a living fossil. Like all brachiopods, it is a filter feeder. Brachiopods are superficially similar to bivalves, both having two shells. Brachiopods are easily distinguished from molluscs because they have (different) dorsal and ventral shells.