A scientist discovers a new organism. the organism is multicellular eats other organisms for food, moves freely from place to place. the organism most likely belongs to

Talking of taxonomic kingdoms, the organism belongs to kingdom Animalia. Among other kingdoms, Archaea, Bacteria, and Protozoa are unsuitable since they include unicellular organisms. This organism can move freely from place to place, thus, it couldn't be neither Plantae nor Fungi, leaving Animalia as the only matching kingdom.