Question

read the information and observe the image to answer the question. in the late 20th century, the classification of organisms was extended to include domains. why was the classification of organisms extended to include domains? because advancements in molecular biology revealed significant genetic differences among organisms domains were never extended in the 20th century because biologists just wanted to make it more complicated for everyone

Explanation:

Advancements in molecular biology allowed scientists to study the genetic material (such as DNA) of organisms more precisely. By analyzing genetic differences, they found that some groups of organisms had significant genetic dissimilarities that were not fully captured by the previous classification systems (like the five - kingdom system). These genetic differences were so fundamental that a new level of classification, the domain, was needed to better represent the diversity and evolutionary relationships among organisms.

Answer:

because advancements in molecular biology revealed significant genetic differences among organisms