Answer:
The answer is they are all easily observed
Step-by-step explanation:
All the features shown in the table are easily observable. This characteristic was essential for Mendel to be able to create the foundations of genetics, which we still use today.
Mendel was an important geneticist who made great discoveries, such as how to transmit traits and other characteristics of genetic alleles.
Peas were chosen by Mendel for several factors, such as the ability to reproduce quickly, both sexually and asexual, as they have several characteristics that are easy to see and that are very specific, because they are cheap and possible to buy in pure lines.