There are certain ants that farm aphids for the food they produce, protecting and defending them for the nourishing survival value they provide. Leafcutter ants farm leaves in order to grow a fungus. This relationship has endured so long that they now depend on each other for existence.
We see a gradient of relationships in biology that go from optional beneficial value such as a food source or protection etc. these relationships can develop into a mutual dependency and perhaps grow all the way to an obligate relationship where one cannot live without the other. In effect, the once separate organisms that farmed each other may merge into an inseparable dance, becoming in effect, one body – each depending on the other for survival.
The various organs in our body follow this mutually dependent relational scheme, but so do some relationships in nature that transcend species lines like that of leafcutter ants and the fungus they farm. We may be witnessing a gradient of relationships that move along a spectrum from useful to necessary and in some cases result in once separate organisms becoming a singular organism over time.
This process of merging may begin with what could be termed “farming” or relationships built on mutual benefit, that over time merge into a single body of mutually nourishing entities. Eukaryotic cells are thought to have emerged over 2 billion years ago may have been one such merger that began as “farming”.
Creatures and or biological bits of information such as proteins and RNA etc. that provide adaptive value may have become so dependent on each other that they merged into a singular body. This in fact may be the backbone of evolution.
Of course this is speculation, but it may be that farming is the start of the process for more complex life forms, but where did farming begin? Perhaps it began long before eukaryotic creatures arose on earth and may have been a precursor to that merger known as endosymbiosis that led to eukaryotic cells.
The article linked below illustrates a farming relationship between a bacteria and amoeba where the bacteria turn the amoeba into farmers. This is one piece of evidence that may indicate that farming may have begun before the emergence of eukaryotes and may indeed be the first step toward the sort of biological convergence we know of as complex organisms.
For the article on the relationship between the bacteria and amoeba that appeared in National Geographic in 2015: Click Here
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