About 80% of vascular plants in the world establish symbiotic relationships with fungi, especially for arbuscular mycorrhitis.  If the endosymbiota adapts to the host`s lifestyle, the endosymbiota changes dramatically. There is a drastic reduction in its genomic size, as many genes are lost during metabolism and DNA repair and recombination, while important genes involved in DNA-to-RNA transcription, protein translation, and DNA/RNA replication are preserved. The decrease in genome size is due to the loss of protein-coding genes and not to the decrease in intergenic regions or the size of the OrF (Open Reading Frame). Species that develop naturally and contain a small size of genes may be responsible for an increased number of striking differences between them, resulting in changes in their rates of evolution. When insect-related endosymbiotic bacteria are transmitted strictly to offspring through vertical genetic transmission, intracellular bacteria overcome many obstacles during the process, resulting in a decrease in the effective population size compared to wild bacteria. The inability of endosymbiote bacteria to restore their wild-type phenotype through a recombination process is called muller`s ratchet phenomenon. The Muller`s ratchet phenomenon, combined with less efficient population sizes, leads to an accumulation of harmful mutations in the non-essential genes of intracellular bacteria.  This may be due to the lack of selection mechanisms that prevail in the relatively “rich” host environment.   Ectosymbiosis is any symbiotic relationship in which the symbiote lives on the surface of the host`s body, including the inner surface of the digestive tract or the channels of the excritical glands.   Examples are ectoparasites such as lice; upcoming eczenymbionts, such as sea spiders, that cling to the jaws of bearded whales; and mutualist eczeobiota such as cleaning fish. A spectacular example of obligatic mutualism is the relationship between siboglinide tubular worms and symbiotic bacteria that live at hydrothermal springs and cold infiltrates. The worm has no digestive tract and depends entirely on its internal symbionts for feeding.
Bacteria oxidize either hydrogen sulfide or methane that the host gives them. These worms were discovered in the late 1980s at hydrothermal springs near the Galapagos Islands and have since been found on deep-water hydrothermal conduits and cold infiltra in every ocean around the world.  When innovations from three sectors of economic activity – which use natural ecosystems, social and collaborative innovations and efficient technologies – come together, they enter into a symbiotic relationship. A radically new sustainable economic model that confirms the possibility of developing a symbiotic relationship (mutually positive growth) between thriving natural ecosystems and intense human activity, in all economic fields, endosymbiosis is any symbiotic relationship in which one symbiote lives in the tissues of the other, either inside cells or extracellular.   Examples of different microbiomes: rhizobia, nitrogenous bacteria that live in root nodes at legume roots; actinomycetes, nitrogen-binding bacteria, such as Frankia, that live in tubers of alder roots; unicellular algae in reef-forming corals; and bacterial endosymbionts that provide essential nutrients to about 10% to 15% of insects. [Citation required] Amensism is often used to describe highly asymmetrical concurrent interactions, such as between the Spanish Capricorn and beetles of the genus Timarcha, which feed on the same type of shrub….