Read the following statements regarding the phylum Chordata: A. All vertebrates are chordates but all chordates are not vertebrates. B. Notochord is replaced by a cartilaginous or bony vertebral column in the adult of all protochordates. C. Protochordates are exclusively marine animals. D. In Cephalochordata, the notochord is present only in the larval tail. E. Vertebrates have a ventral muscular heart with two, thre

Step-by-step solution

Statement A is correct because the subphylum Vertebrata is a part of the phylum Chordata, but other subphyla like Urochordata and Cephalochordata are chordates but not vertebrates. Statement B is incorrect because the notochord is replaced by a cartilaginous or bony vertebral column in the adults of vertebrates, not protochordates. Statement C is correct because protochordates (Urochordata and Cephalochordata) are exclusively marine animals. Statement D is incorrect because in Urochordata, the notochord is present