Life on Earth could not survive in the absence of bacteria. All of the wastes we throw into the ground, certain that they will be broken down and rot away, disappear because of bacteria. Thus, all of our waste products can be processed and recycled. Bacteria break down each part of a dead substance into small minerals that living things can use as food. They purify our water, make our soil fertile, synthesize vitamins in our intestines, convert what we consume into useful sugars and polysaccharides (a carbohydrate group), and combat the harmful bacteria we ingest with our food.
The nitrogen cycle, which is of vital importance to Earth, depends entirely upon bacteria to take nitrogen from the air and convert it into nucleotides and amino acids, our own building blocks. This literally amazing process cannot be carried out by any other living thing, including humanity. Bacteria effortlessly carry out a process that can be achieved only at a temperature of 500 degrees Celsius and at a pressure 300 times greater than normal by using industrial techniques in a matter of seconds.
More important, bacteria provide us with the oxygen we breathe. In fact, much of Earth’s breathable oxygen is supplied by micro-organisms through photosynthesis. Cyanobacteria, algae, and other micro-organisms that fill the oceans, release some 150 billion kilos (331 billion lbs.) of oxygen every year.
All of these things are manifestations of Allah’s artistry, for He created and brought together these awesome complexities, perfect structures, and flawless abilities. This example shows just how complex a single cell can actually be and what superior characteristics it can actually possess. Allah reminds us that we live in need of a single-celled life form. Those who learn from this will strive to attain His mercy and Paradise and appreciate Him as is His due, for He created everything for a purpose:
The keys of the Unseen are in His possession. No one knows them but Him. He knows everything in the land and sea. No leaf falls without His knowing it. There is no seed in the darkness of the ground, and nothing moist or dry that is not in a Clear Book. (Surat al-An‘am, 59)