When was the clydesdale horse domesticated

The first recorded use of the name Clydesdale in reference to the breed was in 1826 at the exhibition in Glasgow. Another theory of their origin, that of them descending from the Flemish horses brought to Scotland as early as the 15th century, was also promulgated in the late 18th century.

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answer; the correct answer to the above statement is (biosphere); ///

i think it's severe storms but i might be wrong