Question

In 1990, Carl Woese introduced the three

domain system for classifying living things,
after the advancement of DNA analysis
allowed for a comparison of species genetic
code. Which of the following is the best
explanation for why domains were added to
the previous system of classification?
C. Domains have always been included, they
were just made official recently.
B. New species are evolving too quickly to
keep up with the old system of classification
D. Some organisms, which were previously
characterized together, were determined to
be genetically very different.
A. The old system of classification was wrong
and needed to be corrected.

Answer 1

D. Some organisms, which were previously characterized together, were determined to be genetically very different.

Step-by-step explanation:

Domains are the highest taxons within the biological classification of living beings. Like other taxons, domains are used to group living beings in a scientifically based classification.

They were added to the classification system after the other taxons were already established. The presence of domains was necessary to group individuals in relation to evolutionary factors. This was necessary because some organisms, previously characterized together, were determined to be genetically very different.