bacteria are the simplest organisms.give reasons

Bacteria are prokaryotic organisms, i.e, they are unicellularand don't have a cell wall around the nucleus...they also lack true mitochondria, chloroplasts... in fact they were the first form of life on Earth...

They are very small...their sizes vary from 0.3 to 0.5 micrometres...

They reproduce asexually by Binary Fission...they reproduce and grow very fast.. even in 4.5 to 9.8 mins...

They can survive any and every where...in snow, marshy areas, rocks, trees, vivipary areas, animal and plant body, etc...

Bacteria locomoteby flagella or gliding...

Hence, all the above mentioned factors prove that: BACTERIA ARE THE SIMPLEST ORGANISMS

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