Seaweed is considered a living organism. It belongs to a group of plants known as algae, which are capable of photosynthesis, a process that allows them to convert sunlight into energy. Seaweeds can be found in various aquatic environments, primarily in oceans and seas, where they play a crucial role in the ecosystem.
Unlike nonliving materials, living organisms like seaweed can grow, reproduce, and respond to their environment. They have cellular structures and metabolic processes that are characteristic of living things. Additionally, seaweeds provide habitat and food for numerous marine species, further emphasizing their importance in the living world of aquatic ecosystems.