Marine organisms are living beings that inhabit the ocean and other saltwater environments. They can be classified into several categories based on their characteristics and habitat, including: 1. **Plankton**: These are tiny organisms that drift in the water column. Plankton can be further divided into phytoplankton (microscopic plants that carry out photosynthesis) and zooplankton (small animals that feed on phytoplankton and other particles).
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