Binary fission is common in the most primitive unicellular organisms such as Simple algae, Bacteria, and many protozoans such as Amoeba and Paramecium, Binary fission happens under different conditions, In suitable conditions, The nucleus...
Gas exchange is the process of obtaining oxygen either directly from the air as in the case of unicellular organisms or by a respiratory system as in the case of multicellular organisms and releasing...
Attempts of classification of living organisms : The Latin philosopher: Aristotle ( more than 2300 years ago ), He was the first who classified animals into red-blooded animals and bloodless animals , Plants into...
The cell is the building and functional unit of the living organism , Living organisms may be unicellular or multicellular , Although the similarity of all living organisms in their building and functional unit...
