Question

Choose the given answers with the alternative provided.
Which of the species contain vertebrates
A. Arthropoda
B. Chordata
C. Annelida
D. Mollusca

Answer 1

Hint: The metameric spine replaces the notochord in a higher form (vertebral column). Lampreys, fish, amphibians, reptiles, birds and mammals are the example of vertebrates. It has an endoskeleton that is composed of bone and cartilage and a central tubular nervous system hollow in the midline. The vertebrates have a particular brain enclosed within the skull (hence the name craniates).

Complete answer:
Chordata: The phylum chordata include a large group of animals that vary from ascidians to humans. Different characteristics such as the notochord, dorsal hollow tubular nerve ligament, tail and pharyngeal gill slits unite these other animals under the same type. These four characteristics are unique to their kind. The existence of such a general structure is interpreted as the result of inheriting common origins. Apart from these four basic structures, there are several other features which are of less diagnostic value.
Vertebrates are the central division of the Phylum Chordata and rank the highest. All vertebrates or craniates are placed under the Subphylum Vertebrate or Craniate. In addition to the basic features of the chord data, vertebrates have many unique features that distinguish them from non-chord and invertebrate data.
Arthropoda-Arthropods are triploblastic animals, bilaterally symmetrical, segmented metamerically. The body of Arthropods is covered with thick chitinous cuticles which form an exoskeleton Muscles are not continuous, but consist of individual striped muscles. The digestive tract is full, and the mouth and anus are at opposite ends of the body. The circulatory system is open with the spinal cord and arteries but without capillaries. From gills to water forms, from windpipe or lungs to terrestrial conditions. No true Nephridia; Excretion via environmentally friendly products or Malpighian tubules or green or coxal glands. The sexes are usually separate, and sexual dimorphism often manifests itself in various forms.
Annelida-Annelida is dominated by water; Sea or freshwater, some land, tube chickens or inhabitants, stranded or live freely. Some are also commensal and parasitic—triploblastic body, bilaterally symmetrical, elongated and worm-like. The body is segmented metamerically; outside with transverse grooves and inside with partition walls in several compartments; Each division is called a segment, metamere. The outer sheath of the body is the cuticle, which is separate from the epidermis beneath it. The body wall is contractile and consists of the outer epidermis, circular and longitudinal muscles. The digestive tract is tubular, complete, and extends from the mouth to the anus. Breathing occurs through the general surface of the body, in some cases through gills. The vascular system is closed.
Mollusca-The phylum Mollusca is a group of invertebrates that have fascinated humans since the dawn of civilization. The members of this group have adopted both on land and in water. Bilateral symmetrical protostome, aligned with a spiral cut and a loose, soft body covered with thick muscle folds, a sheath that expels one or more shells, and a radula in the oesophagus in addition to the bivalves and ventral muscular legs for movement.
So, the correct answer is “Option B”.

Note:
Janvier placed all vertebrate groups under Craniata, and Myxini was excluded from Vertebrates because the group (Myxini) lacked Arcuals, which are embryonic or elementary vertebrate elements. Janvier (1981) and Nelson (1994) use the two terms for different levels of classification. Most authors are interested in the use of the term’s vertebrates or craniates as synonyms. Parker (1982) used the subphylum Craniata taxon as a substitute for vertebrates.