Answer:
Organism: An organism refers to a living thing that has an organised structure, can react to stimuli, reproduce, grow, adapt, and maintain homeostasis.
Example : sea worms, jellyfish, sea anemones, shellfish, squid, octopus and starfish.
Population: A population is a distinct group of individuals, whether that group comprises a nation or a group of people with a common characteristic.
Example: Risso´s dolphin population, Bottlenose dolphin population, Killer whale population.
Community: an interacting group of various species in a common location.
Example : 1) A group of dolphin, 2)group of sea anemones and 3) clownfish or 4) group of whales.
Marine ecosystems include: the abyssal plain, polar regions such as the Antarctic and Arctic, coral reefs, the deep sea, kelp forests, mangroves, the open ocean, rocky shores, salt marshes and sandy shores.
