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Scientific knowledge is always changing. At one time, the kingdom was the highest level of classification. Today, the highest level of classification is the domain. Two of the domains, Bacteria and Archaea both contain microscopic prokaryotic organisms. What would be the best reason for scientists to separate the prokaryotes? Both organisms do not contain organelles. Research showed differences in living environments. It was determined that neither have chloroplasts. There were too many species of prokaryotes to only have 1 domain for them.

Ask by Fernandez Sanders. in the United States
Mar 11,2025

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Scientists separate prokaryotes into two domains, Bacteria and Archaea, because these organisms live in very different environments.

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The Deep Dive

Science loves a good plot twist! In the case of Bacteria and Archaea, scientists decided to separate them primarily because of their vastly different living environments and biochemical processes. For instance, Archaea thrive in extreme conditions like hot springs and salt lakes, while Bacteria are more versatile, found almost everywhere from soil to stomachs! This separation helps capture the incredible diversity of life at the microscopic level. Now, here’s a fun tidbit: the differences extend well beyond environments! Bacteria and Archaea have distinct cell wall compositions and ribosomal structures, making them more like distant cousins than siblings in the tree of life. It’s an intriguing reminder that life can adapt in unexpected ways—evolution sure knows how to keep things interesting!

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