Why was mendel successful when others failed?

Using a simple organisms like the garden pea, Mendel was able to control pollination among his experimental plants, and most importantly, he used true breeding plants with easily observable characteristics, such as flower color and height. He also kept meticulous records and discovered consistent data that involved thousands of plant-breeding experiments over eleven years. He studied physics and math under Christian Doppler (1803–1853; the eventual discoverer of the Doppler Effect) at the University of Vienna, which helped Mendel understand statistics and experimentation and eventually led him to determine the laws for his famous heredity works which is why he became successful.

the index of refraction of the second medium is higher. i just took the test trust me !