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Ancestors of colostomies are

1. Myxinoidea
2. Arthropods
3. ostracoderms
4. Urochordates

Correct answer: Urochordates

Solution

Urochordates (tunicates) are primitive chordates and are considered ancestral/closest to the lineage leading toward vertebrates. The other options are either jawless vertebrates (Myxinoidea, ostracoderms) or unrelated arthropods.

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