While exploring a sulfur spring, a scientist finds a new organism. It is single-celled, lacks a cell wall, has a few internal membranes, and appears to have set up a symbiotic relationship with a species of free-living purple sulfur bacteria that are common in the spring. There are no other organisms within it. This new organism would be considered a(n):

Question

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The organism is a living intermediate because it has characteristics of both prokaryotes (single-celled, lacks a cell wall) and eukaryotes (has internal membranes), suggesting it is an evolutionary intermediate.

While Exploring a Sulfur Spring, a Scientist Finds a New