Question

Choose the correct answers from the alternatives given.
Of the following types of animals, all are segmented except:

• A. arthropods
• B. annelids
• C. echinoderms
• D. chordates

Answer 1

The correct option is C echinoderms

Arthropods have segmented bodies, like the annelid worms. These segments have become specialized, however, with one pair of jointed appendages added to each segment. Animal groups that fall under chordate phylum include fish, amphibians, reptiles, birds, and mammals. Chordates use heteromeric segmentation in which the link between segmented parts appears more subtly.

Echinodermata is the first phylum where we see deuterostomes, meaning their anus develops before their mouth Animals in phylum Echinodermata are Coelomates. Their body has no segmentation but this doesn't mean it doesn't have repetition.

So, the correct option is, 'Echinoderms'.