Endosymbiotsis can best be described as Question 1 options: how a multicellular organism uses cell division to grow one organism living completely inside another organism two organisms occupying the same type of environment many cells of one type of organism living closely together

Endosymbiosis can best be described as one organism living completely inside another organism.

Explanation:

Endosymbiosis is referred to a mutually beneficial relationship between two organisms where one organism lives completely inside another organism. The organism which lives inside another one is known as an endosymbiont.

According to the endosymbiotic theory, all eukaryotic cells are evolved from early prokaryotes. Eukaryotes engulf prokaryotic cells capable of aerobic respiration by phagocytosis. The engulfed prokaryotic cells remain undigested and contribute new functionality such as energy production, photosynthesis, etc to the host cell. Eventually, the engulfed cell became an organelle. The organelles such as mitochondria and chloroplasts in eukaryotic cells are considered to have arisen through endosymbiosis.

One example of endosymbiosis includes the relationship between legumes and nitrogen-fixing bacteria (endosymbiont) that live in the root nodules of legumes. The nitrogen-fixing bacteria helps the plants to absorb nitrogen from the soil and plants provide food for the bacteria. The other examples include the relationship between termites and the microorganisms in its gut, single-cell algae living inside corals, etc.

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