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What is the primary skeletal tissue of chondrichthyan fishes?
What is the primary skeletal tissue of chondrichthyan fishes?
What type of skeleton is found in invertebrates and can take forms like the gastrovascular cavity of cnidarians?
What type of skeleton is found in invertebrates and can take forms like the gastrovascular cavity of cnidarians?
What type of movement requires muscles working in opposition to each other?
What type of movement requires muscles working in opposition to each other?
What cells maintain cartilage in vertebrates?
What cells maintain cartilage in vertebrates?
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What is the primary function of hydrostatic skeletons in invertebrates?
What is the primary function of hydrostatic skeletons in invertebrates?
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