sentence: Zooids are very small, highly modified individuals.
sentences_before: Physalia' look like a jellyfish, but they really are not. The Portuguese Man o' War is not a single animal. It is rather a siphonophore. This is a colony of four kinds of zooids.
sentences_after: These zooids are specialized polyps and medusoids. Grzimek's Animal life encyclopaedia'. Each type of zooid does not have some structure and functions. It depends for survival on the others doing what it cannot do by itself.
concept_name: zooid
headings: Portuguese Man o' War Structure
categories: Cnidarians