Question

ome modern eukaryotes, such as Giardia intestinalis, lack mitochondria but still retain some of the genes for mitochondrial proteins. What logical conclusion can be drawn about these organisms?

Answer 1

At one point in their evolution, they contained mitochondria.

Step-by-step explanation:

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Answer 2

Best answer is: d) At one point during their evolution, these organisms contained mitochondria.

The presence of genes for mitochondrial proteins suggests that these genes are a relic of the time when those bacteria contained mitochondria. Over time and many mutations, the bacteria may have lost the mitochondria, but not necessary purged every gene related to mitochondria.