Which of the following represents the correct combination of a taxonomic group with its characteristics, without any exception?

Moderate

A

Annelida - Triploblastic, metamerically segmented bisexual animals with nephridia.
B

Arthropoda - Triploblastic ,bilaterally symmetrical animals with chitinous exoskeleton, jointed appendages and open circulatory system.
C

Mollusca - Triploblastic, unsegmented enterocoelomates with organ system level of organisation.
D

Echinodermata - Spiny skinned schizocoelomates with organ system level of organisation.

Solution

All Arthropods are triploblastic bilaterally symmetrical animals. All Arthropods have chitinous exoskeleton, jointed appendages and open circulatory system. Among Annelids, Polychaetes are unisexual animals (e.g., Nereis). All Molluscans are schizocoelomates. All Echinoderms are enterocoelomates.

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