Concept:Chlorophyll is a green pigment that enables organisms to carry out photosynthesis using sunlight.Explanation:Euglena is a single-celled freshwater organism that contains chlorophyll.It can make its own food through photosynthesis, similar to plants.Hydra, Jellyfish, and Sycon are all animals without chlorophyll.They cannot perform photosynthesis and must obtain food from other sources.Answer:A. Euglena