Immobile living organisms that are capable of releasing oxygen?

There are eight kingdoms of living nature. The attached way of life and the release of oxygen are characteristic of the representatives of the plant kingdom. They have an autotrophic way of life. This means that plants are able to independently synthesize organic substances from inorganic ones. This happens during the course of photosynthesis. Also, oxygen is released during photosynthesis, which is a by-product of the reaction. In the presence of an autotrophic type of nutrition, plants do not need to move in search of food.