Marine vertebrates are animals that possess a backbone (vertebral column) and live primarily in ocean or sea environments. This group includes a diverse range of species that are adapted to marine habitats. The main classes of marine vertebrates are: 1. **Fish**: This group includes both bony fish (Osteichthyes) and cartilaginous fish (Chondrichthyes), such as sharks and rays. Fish are the most diverse and abundant group of marine vertebrates.
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