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But through evolution, organisms have become much more complex. If every living thing evolved from a single cell, then obviously because of evolution things have become more complex.
Being a microbiologist, I always cringe when I read a statement like this. If we count organism to organism, single celled bacteria outnumber all multicellular life gazillions to one. The majority of life on earth is still very simple. Complex life only makes up a tiny fraction of the total biosphere. If we counted the cells from the top of your head to the tips of your toes, bacterial cells would outnumber your human cells 1,000 to one (and this is a conservative value). If you count small roundworms found in soil as simple, then complex life is really outnumbered.
Many people, scientists and layman alike, like to focus on macrobiology. However, the devil is in the fine details. In this case, bacteria and other single celled organisms.
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