Question

What is the oldest domain of life?

Answer 1

Archaea:

1. Archaea is the oldest domain of life.
2. Archaea are prokaryotic microorganisms that belong to the third branch (or domain) of life, separate from the first two - Bacteria and Eucarya.
3. Archaea are a class of single-celled organisms.
4. These microbes are prokaryotes because they lack cell nuclei.
5. Archaea can be spherical, rod-shaped, spiral-shaped, lobed-shaped, rectangular-shaped, or irregular-shaped.
6. Archaea are obligate anaerobes that live in low-oxygen settings (e.g., water, soil).
7. They are extremophiles, meaning they can survive under the toughest conditions.
8. For example, thermoacidophiles, halophiles, methanogens, and so on.
9. They have distinct cell wall architectures than bacteria, which allows them to thrive in harsh environments.