Cells; these are the basic building blocks, they become specialised, e.g, Red blood cell, Nerve cell, Sperm or Egg cell
Cells -> Tissues
Tissues; a collection of all the same specialised cells, e.g, Heart cells, Muscle cells
Tissues -> Organs
Organ; a collection of different tissues, e.g, Heart, Lungs
Organ -> Organ System
Organ System; a collection of different organs, e.g, Circulation System (Heart, Blood, Lungs, Blood Vessels)
Organ System -> Organism
Organism; the complete living organism, e.g, Mam, Tulip. Hamster
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