Question

why is latin the primary language for scientific names ?

Answer 1

After the Roman empire spread through Western Europe, Latin was established as a common language spoken widely among the population and an essential language of governance and politics. As latin changed over time and gradually split apart and became the various Romance languages, such as Spanish, French, and Italian, a certain dialect of Latin remained a key religious language in the Catholic Church and the language of scholarship.
European scholars throughout the continent spoke Latin as a common language between various European nations. Key scientific figures such as Newton and Mendeleev published their papers and findings in Latin.
When Swedish scientist Carl Linnaeus started to devise a system of classifying organisms, he gave different phyla and species Latin names, because Latin was such a universal scholarly language in Europe. Scientists until this day have continued to name species in Latin as a continuation of this tradition, but indeed now often use languages spoken natively in the regions where new species are discovered.