The document describes the hierarchical organization of cells, tissues, organs, systems and organisms. It begins with cells as the basic unit and building block, which can be animal or plant cells. Animal cells include red blood cells, nerve cells and sperm cells while plant cells include leaf and root hair cells. Cells combine to form tissues like muscle or root hair tissue. Tissues combine to form organs such as the heart or leaf. Organs combine to form systems such as the circulatory or leaf canopy system. Systems combine to form whole organisms such as the human or a plant.

1. Colussi Giacomo & Restelli Francesca THE CELL http://migration.files.wordpress.com/2007/07/eukaryotic-cell.jpg

2. CELL TISSUE ORGAN SYSTEM ORGANISM

3. CELL ANIMAL CELL PLANT CELL Membrane Nucleus Cytoplasm Chloroplasts Cell wall Vacuole http://webinstituteforteachers.org/~halliepeskin/2003/pics/imdumb.jpg http://www.cartage.org.lb/en/themes/Sciences/Zoology/ AnimalPhysiology/Anatomy/AnimalCellStructure/animalheader.jpg

4. TYPE OF ANIMAL CELL Red blood cells Nerve cells Sperm cells Egg cell http://newsimg.bbc.co.uk/media/images/ 42574000/jpg/ _42574053_egg_cell_ap_203b.jpg http://i.ehow.com/images/Global Photo/ Articles/5454138/381664- main_Full.jpg http://www.e-spaces.com/Portfolio/ trans/blood/nano/nanobot_neurons_ v8.jpg http://media.independent. com/img/photos/ 2007/06/25/CRIB_blood_ cells.jpg

5. TYPE OF PLANT CELL Leaf cells http://www.sciencedaily.com/images/2005/02/050224114043.jpg Root hair cells http://www.emc.maricopa.edu/faculty/farabee/BIOBK/leafstru.gif

6. TISSUE http://esciencenews.com/files/images/200906251693740.jpg Muscle http://lima.osu.edu/biology/images/zeahair.jpg Root hair tissue

7. ORGAN Heart Leaf http://upload.wikimedia.org/wikipedia/commons/thumb/9/90/ Leaf_anatomy.svg/600px-Leaf_anatomy.svg.png http://www.rush.edu/rumc/images/ei_0243.gif

8. SYSTEM http://www.markdroberts.com/images/trees-leaf-canopy-6.jpg Leaf canopy system Circulatory system http://www.carolguze.com/images/organsystems/circulatory2.jpg

9. ORGANISM Human Plant http://lh4.ggpht.com/_lRGislJejZ0/SR0O2ER63WI/ AAAAAAAACBE/cyMYUik0CaM/image_thumb%5B29%5D.png?imgmax=800 http://frit.lss.wisc.edu/fr227/images/pics/baobab.jpg