A biologist claims to have discovered a single-celled organism that is evolutionarily unrelated to any organisms known to inhabit Earth. Which observation made during an extensive study of the organism most solidly supports the biologist's claim?

Answer: The chemical identities of the aminoacids making up the organism's proteins differ from those found in bacteria.

Explanation:

The bacteria is considered as the most primitive organism to be existed on earth.

This fact is suppoted by the molecular and chemical composition of the living beings which suggests that on comparing the bacteria with other organisms supports the difference.