1.) noticed other things about peas 2.) highly predictable ways 3.) tall pea plant due to dominant allele
Either a bachelor's degree in visual arts, specializing in photography, or specialized training in photography in high school, college or specialized training schools
or extensive on-the-job training under the supervision of a professional photographer.
They did this so when the Mongols took over China, the Chinese could not gain high power and over throw the mongols.