Based on the common features like presence of notochord and dorsal hollow neural system, animals like fishes, amphibians, reptiles, birds along with mammals are included in which Phylum?A) MammaliaB) ChordataC) PrimataD) Insecta

The correct answer is B) Chordata.
Animals that share common features such as the presence of a notochord, dorsal hollow neural tube, and other specific characteristics belong to the Phylum Chordata.
1. Phylum Chordata:
o Chordata is a diverse phylum that includes animals with certain key features at some point in their life cycle:
 Notochord: A flexible, rod-like structure that provides support. In most vertebrates, it is replaced by the vertebral column (spine) during development.
 Dorsal hollow nerve cord: This is a tube-like structure that runs along the back of the organism, which later develops into the brain and spinal cord in vertebrates.
 Pharyngeal slits or pouches: These structures are used in filter feeding in some species and develop into different structures, such as gills in aquatic organisms.
 Post-anal tail: An extension of the body that extends beyond the anus, which may be present during certain developmental stages.
2. Subgroups of Phylum Chordata:
o The phylum Chordata is further divided into three subphyla:
 Urochordata: Includes animals like tunicates (sea squirts), which have a notochord in their larval stage.
 Cephalochordata: Includes lancelets, which retain the notochord throughout their life.
 Vertebrata: This subphylum includes all vertebrates such as fishes, amphibians, reptiles, birds, and mammals. They have a well-developed backbone (vertebral column) replacing the notochord in adult forms.
3. Other Phyla:
o A) Mammalia: This is a class within the subphylum Vertebrata, so it is not a phylum on its own.
o C) Primata: This is an order within the class Mammalia and includes animals like humans, monkeys, and apes.
o D) Insecta: This is a class within the phylum Arthropoda, which includes insects. Insects are not part of Chordata.
The animals like fishes, amphibians, reptiles, birds, and mammals, which have a notochord and a dorsal hollow nerve cord, are included in the Phylum Chordata. Therefore, the correct answer is B) Chordata.