In unicellular They are single celled organisms like Amoeba and they have a large surface area to volume ratio. They obtain nutrients by diffusion, facilitated diffusion or active transport across their cell membrane. They use holzoic nutrition, taking in larger molecules by endocytosis to food vacuoles which then fuse with lysosomes and their contents are then digested by lysosomal enzymes.The products of digestion are then absorbed into the cytoplasm and anthing indigestible is egested by exocytosis

in multicellular --They are single celled organisms like Amoeba and they have a large surface area to volume ratio. They obtain nutrients by diffusion, facilitated diffusion or active transport across their cell membrane. They use holzoic nutrition, taking in larger molecules by endocytosis to food vacuoles which then fuse with lysosomes and their contents are then digested by lysosomal enzymes.The products of digestion are then absorbed into the cytoplasm and anthing indigestible is egested by exocytosis