👉 Protozoa, also known as protozoa, are a group of eukaryotic organisms that belong to the class Animalia. They have a single cell nucleus and possess a large number of organelles, including mitochondria, chloroplasts, and cytoplasmic membranes. Protozoa play a crucial role in many processes within the marine environment, such as photosynthesis, nutrient cycling, and decomposition. Protozoa include various types of amoeba, which are unicellular