cellular organisation

• Organelle


  the internal structures that make up cells
• Cell


  the smallest unit of an organism
• Tissue

  group of cells with similar function and structure, work together to do a particular job.
• Organ


  made from a group of tissues, work together to do a particular job
• Organ system


  made from a group of different organs, all work together to do a particular job.
• Organism

  an individual plant, animal or single-celled organism (unicellular or multicellular)