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One of the challenges to a student enrolled in a high school biology course is the tidal wave of new vocabulary words. I have found that crossword puzzles are of great benefit to the student. It helps the student learn the definition of the term as well as provide practice in learning to spell the word. Here is a free crossword puzzle that I give my students when we are studying the phylum Nematoda and the phylum Platyhelminthes. It contains 41 vocabulary words used in this topic.