These are the autotrophic self feeding components Most of them are too small to be individually seen...........

Environment and Ecology Concept of Ecosystems

These are the autotrophic (self-feeding) components. Most of them are too small to be individually seen with the unaided eye. However, when present in high enough numbers, some varieties may be noticeable as colored patches on the water surface due to the presence of chlorophyll within their cells and accessory pigments in some species. It absorb energy from the Sun and nutrients from the water to produce their own food.

The above passage best describes which of the following?

Phytoplankton

Coral reefs

Niche

None of the above

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Explanation:

Phytoplankton are photosynthesizing microscopic biotic organisms that inhabit the upper sunlit layer of almost all oceans and bodies of fresh water on Earth. They are agents for "primary production", the creation of organic compounds from carbon dioxide dissolved in the water, a process that sustains the aquatic food web. Phytoplankton obtain energy through the process of photosynthesis and must therefore live in the well-lit surface layer (termed the euphotic zone) of an ocean, sea, lake, or other body of water.