The correct answer is Phytoplankton, Herbivores, Carnivores and Whales.

• Food chain- It is the sequence of transfers of matter and energy in the form of food from organism to organism.
• It begins with the producer organism, follows the chain and ends with a decomposer organism.
• Phytoplankton
  • They are microscopic marine algae.
  • It is the base of several aquatic food webs.
  • In a balanced ecosystem, they provide food for a wide range of sea creatures.
• Animals that eat phytoplankton are called herbivores.
• Phytoplankton is eaten by primary consumers like zooplankton, small fish, and crustaceans.
• Mollusks, small crustaceans (such as shrimp and krill) and small fish like sardines and herring eat large amounts of the zooplankton. These are carnivores.
• Small fish and crustaceans are eaten by larger predators like Whales.

• The sun is the initial source of energy, which provides energy for everything on the planet.
• The producers make up the first level of a food chain that utilizes the energy from the sun to make food.
• Consumers are the largest part of a food web.
• It includes herbivores which are animals that eat plants, carnivores which are animals that eat other animals, parasites are those organisms that live on other organisms.
• Decomposers are organisms that get energy from dead or waste organic material and convert organic waste materials into inorganic materials like nutrient-rich soil or land.