Tiny organisms were collected from thermal vents deep in the Pacific Ocean. The characteristics below describe these primitive organisms. 1) They are all unicellular.

2) They live in harsh environments.

3) Most have a cell wall.

In which domain would these organisms be found? (SC.6.L.15.1)

A. Archaea

B. Bacteria

C. Eukarya

D. Protista

A. Archaea

Explanation:

Living organisms have been taxonomically classified into a highest ranking taxa called DOMAIN. The domains are as follows: Eukarya, Prokarya (bacteria) and Archaea. Although both Domains Bacteria and Archaea are unicellular, the Archaea is specifically characterized by their ability to survive in harsh weather conditions like the thermal vents tiny organisms were collected from.

Also, members of the domain Archaea have a unique cell wall different from other organisms like bacteria. Hence, based on the matching characteristics of the collected tiny organisms, they would be found in the Domain ARCHAEA.

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