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Invertebrates are animals that lack a backbone, making them distinct from vertebrates. They encompass a vast array of species, representing over 95% of all animal life on Earth. Invertebrates can be found in various habitats, including marine and freshwater environments, as well as terrestrial ecosystems. In the context of marine life, invertebrates play crucial roles in maintaining the balance of oceanic ecosystems. They range from microscopic plankton to large colonial organisms like corals. Many are filter feeders, consuming phytoplankton and other organic matter suspended in the water column, while others are active predators, scavengers, or herbivores. Invertebrates in marine plants primarily consist of algae and other photosynthetic organisms that do not have true roots, stems, or leaves. These include single-celled phytoplankton, multicellular macroalgae (seaweeds), and various symbiotic associations with other marine invertebrates. In summary, invertebrates are a diverse group of animals that exclude vertebrates and encompass a wide range of species found in aquatic and terrestrial environments. In the context of marine life, they play essential roles in maintaining ecosystem balance as both autotrophic (phytoplankton) and heterotrophic organisms. They also form symbiotic relationships with marine plants, such as algae, further emphasizing their importance within marine ecosystems.