Final answer:
Three domains that comprise the tree of life are:
1. Bacteria
2. Archaea
3. Eukarya
Step-by-step explanation:
The tree of life comprises three primary domains: Bacteria, Archaea, and Eukarya. Bacteria and Archaea are both prokaryotic, lacking membrane-bound nuclei, while Eukarya includes organisms with complex, membrane-bound nuclei. This classification reflects fundamental differences in cellular structure and organization among living organisms.
Bacteria, the most diverse and abundant domain, consists of single-celled organisms with a wide range of shapes and metabolic pathways. They play crucial roles in various ecological processes, such as nutrient cycling and symbiotic relationships. Archaea, often found in extreme environments, share similarities with both bacteria and eukaryotes but possess unique genetic and biochemical features. Eukarya, encompassing plants, animals, fungi, and protists, showcase greater complexity with membrane-bound organelles and diverse multicellular forms.