What was the deciding factor that helped researchers determine whether Riftia is an animal or a plant?

Name: What was the deciding factor that helped researchers determine whether Riftia is an animal or a plant?
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Riftia, also known as the giant tube worm, was determined to be an animal because it lacks cell walls and chloroplasts, which are characteristic features of plants. Plants have cell walls and chloroplasts for photosynthesis, while animals, including Riftia, do not.

What Was the Deciding Factor That Helped Researchers Determine Whether