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A set 4 jars of brown hydra (each a class size of 30) and 1 large jar of daphnia (class size of 120), for up to 120 students. The daphnia is used for demonstrating ingestion in Hydra.Desired Date of Arrival can be entered during checkout. If you are ordering living organisms and want more than one delivery date, you will need to make separate orders for each delivery date.