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Abstract Hydra is a multicellular organism which feeds on other small multicellular organisms. The main source of food for hydra is brine shrimp, but they can still consume other organisms for food. The goal of this experiment is to determine if the amount of light in the environment of hydra will affect the feeding behavior of the hydra. It was hypothesized that a direct positive relationship would exist between the amounts of light and the feeding of the hydra (the more light, the more hydra would feed). To control the amounts of light, 3 separate petree dishes were wrapped in varying layers of violet saran wrap and groups of hydra with food were observed in each dish. The different groups of hydra studied in environments with different amounts consumed equal amounts of food within the period of 30 minutes. The results of this experiment indicated that no relationship exists between the amounts of light in the environment and the feeding behavior of hydra. This is due to the fact that the different amounts of light did not affect the amount of food consumed. From this observation, one can conclude that hydra do not depend on light when it comes to feeding. Introduction Hydra is a microscopic multicellular octopus-like organism which mainly feeds on brine shrimp (Muller-Parker, G., 1983). The body of a hydra consists of three main parts, a gastrodermis layer on the inside of the body which contains digestive enzymes, a middle layer called the mesoglea, and an outer layer containing sensory, muscular, and stinging cells (Guild, N. and Bever, K., 2002).
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