One cell, two orifices, Bio 101. The 'lowly' paramecium. Yet in a recent Discover Magazine article (May 2011) we learn how amazingly complex this simple creature is.
1) It can swim 10 times the length of its body in one second
2) has 40,000 genes, twice that of a human cell
3) epigenetic potential–in which environmental facts influence gene expression
4) periodic sexual reproduction in which genetic material is exchanged between organism which reinvigorates their offspring
5) thousands of cilia which can change direction
6) symbiotic relationship with chlorella algae providing them with photosynthetic (light) energy
Even the most "primitive" of living things is mindblowingly complex. We still don't really understand how it all happens