A specific unique character belonging to an individual is called a trait.
It is difficult to observe all the traits common in living organisms as there is a vast variety of organisms present on the planet.
There are millions of organisms present in the aquatic, terrestrial layers and cannot be observed for the traits.
Also, some traits are not phenotypically visible but genetically present.
Therefore, it is difficult to observe traits.
To learn more about traits follow the link:
https://brainly.com/question/9523954
