Question

In what respect do you consider bacteria as a simple organism?

Answer 1

Bacteria reproduce from a sexual methods, such as Binary Fission, and they reproduce and grow very fast. Also, due to their simplistic structure, they can survive in a variety of hostile climates, such as in snowy, windy, marshy and extremely hot conditions.
Lastly, movement is caused with the help of cilia and flagella, or even by gliding.
Hence, these all traits show why bacteria can be considered as simple organisms.