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Cloned organs and muscle tissue

By the year 2050, lab-grown meat will have become cheaper than harvested meat due to popular demand, and the livestock population will have significantly reduced. While chickens and cattle will still be used for eggs and milk respectively, only a small minority will be killed for meat, and pigs will be thought of more as intelligent pets than a source of food. 

While these technologies were meant for use in agriculture, they also have positive effects on ocean life as well, as lab-grown fish taste the same, but do not disrupt ecosystems due to overfishing or contain mercury. 

Similar technologies will be used in healthcare to replace lost or damaged limbs and organs. 
This will greatly reduce the need for organ donors and artificial limbs, and since the new organs would be genetically identical to the old ones, recipients would not have to take immunosuppressants.
In some cases (although this will most likely not be widespread for a few more decades), genetically manipulated tissue samples grown into reproductive systems will allow transgender people who have undergone "bottom surgery" to bear or sire biologically related children as the gender they identify as rather than the gender they were born as.

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