Show on your drawings the features, which make them good at a particular job. Test yourself or get someone to test you on the table above. Organelle Microscopic structure which does a particular job in a cell. E.g. the nucleus Cell Basic unit of life. Unicellular organisms only have one cell.
Multicellular organisms have many cells.
Tissue Group of cells of the same type doing a particular job. E.g. the blood Organ Group of tissues doing a particular job between them. E.g. the heart Organ system Group of organs doing a particular job between them.