Kidney, heart, stomach: Organ.
Amoeba, paramecium, euglena: Cellular.
Colonial organisms: Cellular.
Respiratory, digestive: System.
Groups of cells performing a common function: Tissue.
Body systems working together for the good of the whole: Organism.
Muscle, fat, bone: Tissue.
Organs grouped to perform a common process: System.
Tissues arranges into units t perform a function: Organ.
Algae, frog, rabbit: Organism.
Hope this helped! Have a wonderful day!! <3