Question

Annelida includes invertebrates which have
A. Metameric segmentation
B. Triploblastic body
C. Coelomate organisation
D. All of the above

Answer 1

Annelids are bilaterally symmetrical, triploblastic, coelomates, invertebrate species. They also have locomotive organs termed as parapodia.

Complete answer:
- Invertebrates are animals that neither contain nor grow a vertebral column originating from the notochord. Invertebrates are creatures with no spine or bone framework. They range in size from tiny mites and almost invisible flies to giant squid with soccer-ball-sized eyes. This covers all species, except the subphylum Vertebrata. Common types of invertebrates include arthropods, mollusks, annelids and cnidarians.
- Annelids are a phylum of invertebrate worms. They are segmented worms of more than 17,000 recognized species. Well known species are earthworms and leeches. Annelids can be present in most of the wet conditions.
- Any of these animals are parasitic or cooperative. When the bodies of species are made up of segments and the segments are identical to each other, this type is known as metameric segmentation. Annelid exhibits a metameric segmentation.
- All annelids are bilaterally symmetrical creatures. They are triploblastic, which means consisting of three embryonic tissue layers named mesoderm, ectoderm, and endoderm. About all annelids have a fluid-filled cavity between the outer wall of the body and the intestine, and this is referred to as coelom and is also coelomates.

Thus, the correct answer is option D. i.e., All of the above.

Note: Annelids exist in and have adjusted to diverse ecologies. Some live in aquatic ecosystems as distinct as hydrothermal vents and coastal zones, some in freshwater, and others in tropical terrestrial habitats.