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Q19: Which of the following characteristics are shared
Q20: Serial repetition of segments is a defining
Q21: Which of the following best describes sponges?<br>A)They
Q22: Sponges are mostly found in _.<br>A)marine ecosystems<br>B)fresh
Q24: Which of the following groups are mollusks?<br>A)Gastropods<br>B)Bivalves<br>C)Cephalopods<br>D)All
Q25: What is the main difference between amphibians
Q26: Which of the following is a key
Q27: Worms all appear to be closely related
Q28: Flatworms are most closely related to the