Actually, coleom is the body cavity that is between the digestive system and the body wall.
A coelom is a fluid-filled body cavity found in many animals, including most vertebrates and some invertebrates. It helps support and protect internal organs, as well as facilitating movement and growth by providing space for organs to expand and contract freely.
Acoelomate is an animal that lacks a body cavity or a coleom.
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Free-living or colonial organisms with diverse nutritional and reproductive modes Also all protists are eukaryotic which means that each of their cells has a nucleusAlso some of them are decomposer