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.
Arugula (rocket or roquette) This variety used to be hard find, but can now be found at many supermarkets. This variety is characterized by small, flat leaves with long stems, quite similar looking to dandelion leaves, and a peppery taste. This lettuce is usually paired with other varieties to balance out the taste.