Which of the following is true about the tree of life?

a. archaea are more closely related to bacteria than they are to eukarya
b. there is no common ancestor of all life forms living today
c. many organisms living today cannot be grouped into one of the three domains
d. two of the three domains of life consist of prokaryotic organisms
e. all prokaryotes and their common ancestor make up a clade

The correct answer is option d. "Two of the three domains of life consist of prokaryotic organisms".

Explanation:

According to biological taxonomy, a domain is the highest rank and the most broad category of classification of life. This classification is known as the tree of life, and the three domains that comprises it are: Archaea, Bacteria, and Eukarya. Two of the three domains of life consist of prokaryotic organisms (Archaea and Bacteria), and the last domain correspond to eukaryotic organisms.

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