What does the phylum represented by this specimen have in common with a sea urchin?

Question

BlackTom AI · Accepted Answer

To determine what the phylum represented by this specimen has in common with a sea urchin, we must compare its basic developmental and phylogenetic features with those of sea urchins.
Option 1: lophotrochozoan. This group is a major clade of protostomes (includes mollusks, annelids, etc.). Sea urchins are echinoderms, which are not lophotrochozoans, and they are not protostomes, so this option is incorrect.
Option 2: diploblastic. Diploblastic animals (like cnidarians and ctenophores) have only two germ layers. Sea urchins are triploblastic (three germ layers: ectoderm, mesoderm, endoderm). Therefore, this choice does not describe sea urchins or the specimen if it is more complex than diploblastic organisms, making it incorrect.
Option 3: same phylum. Since sea urchins belong to Echinodermata and the specimen in the image is not an echinoderm, claiming they are in the same phylum would be inaccurate. Hence, not correct.
Option 4: protostome. Protostomes and deuterostomes are two major developmental modes. Sea urchins are deuterostomes, not protostomes, so this option is false for the pair in question.
Option 5: deuterostome. Both sea urchins (echinoderms) and the phylum likely represented by the specimen (if it is a chordate-derived animal) share the deuterostome developmental pattern, where the blastopore develops into the anus and embryonic development is indeterminate and often radial. This is the correct shared feature to identify.
Option 6: ecdysozoan. Ecdysozoa includes animals that molt, such as arthropods and nematodes. Sea urchins do not molt as part of their developmental biology, so this is incorrect for the comparison.
In summary, only the deuterostome option describes the shared developmental mode between sea urchins and the specimen, while all other options describe features or groups that do not apply to the commonality with sea urchins.

W25 BIOL D006A 02Y Form/Funct In The Biolgcl Wrld Animal Review Test

What does the phylum represented by this specimen have in common with a sea urchin?

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