GEOLOGY

Detailed explanation-1: -Phytoplankton, also known as microalgae, are similar to terrestrial plants in that they contain chlorophyll and require sunlight in order to live and grow. Most phytoplankton are buoyant and float in the upper part of the ocean, where sunlight penetrates the water.

Detailed explanation-2: -There are two types of plankton: phytoplankton, which are tiny plants, and zooplankton, which are tiny animals. Phytoplankton are so small that you need a microscope to see them. Types of phytoplankton include dinoflagellates, diatoms, cyanobacteria and green algae.

Detailed explanation-3: -The ocean produces oxygen through the plants (phytoplankton, kelp, and algal plankton) that live in it. These plants produce oxygen as a byproduct of photosynthesis, a process which converts carbon dioxide and sunlight into sugars the organism can use for energy.

Detailed explanation-4: -Important groups of phytoplankton include the diatoms, cyanobacteria and dinoflagellates, although many other groups are represented.

Detailed explanation-5: -Algae are sometimes considered protists, while other times they are classified as plants or choromists. Phytoplankton are made up of single-celled algae and cyanobacteria. As algae can be single-celled, filamentous (string-like) or plant-like, they are often difficult to classify.