Which of the following has an organization that may be similar to an evolutionary stage between unicellularity and multicellularity?

Question

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Volvox is a colonial green algae, meaning it is a group of individual cells living together in a coordinated manner. This is similar to an evolutionary stage between unicellularity and multicellularity as the individual cells have begun to work together but are not fully integrated into one organism. Thiobacillus, Amoeba, and Plasmodium are all unicellular organisms, not showing this evolutionary stage.

Which of the Following Has an Organization That May Be