Question

the reasons for not believing in unicorns and yetis

Answer 1

Actually the reason for that is they are just cartoons the cartoons formed by arts you will study more when you grow up hope this answer finds you useful thank you

Answer 2

Because they are not really proved if they exist or don't. As long run they're known as a fictional character mainly seen in Anime or cartoons. Actually Unicorns are mostly seen in Fairy tales and is the child's favorite dream pet. Yetis are considered dangerous and mostly has a frightening look. 

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