According to the passage, what does the term **'multiphyletic group'** signify in relation to algae?

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**Solution:**

1. The passage states that algae belong to a **multiphyletic group**, which means the species classified under this group do **not share a common ancestor** and are **not necessarily closely related**.

2. This directly corresponds to option 3: "No common ancestor, not closely related."

3. Other options are incorrect because:
   - "Having a common ancestor" contradicts the definition of multiphyletic.
   - "Being closely related species" applies to monophyletic groups, not multiphyletic.
   - "Having diverse morphoanatomical characteristics" describes variation but does not define multiphyletic groups.

**Answer:** No common ancestor, not closely related

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