Every link of the food web is represented in a healthy coral reef. Being the biggest and most powerful creatures in the ocean, they prey on the larger fish as well. All other organisms of the ocean are largely dependent on this microscopic plant.
Most of these aquatic species are tied together through the food web. Known as 'primary producers' of food, they use solar energy to convert carbon dioxide and other nutrients into carbohydrates, that are used by marine creatures. The foundation of the sea's food chain is largely invisible. You may have heard the terms food chain, food web, and food pyramid. In the ocean, this might be one of the very abundant phytoplankton. Apex predators are well-versed in hunting, and are quite helpful in controlling the population of other species of the marine world. What do they mean, and how are they different. Any disruption caused to any member in the chain is a serious blow to the entire food chain. If not, try to find the manual that came with the furnace. In a food chain, you begin with one plant.