Jawapan

2014-03-06T21:20:44+08:00
Human are made up by million individual cell works together to form tissue,organ and system.
cell-epithelial cells,nerves cells,egg cell(ovum),red blood cells
tissue-muscle tissue,connective tissue,nerves tissue
organ-liver,heart,skin
system-blood circulatory system,digestive system,respiratory  system,nervous system