Difference between chordates and non chordates?

Question: Difference between chordates and non chordates?

The main difference between chordates and non-chordates is the presence or absence of a notochord, a flexible rod-like structure that provides skeletal support. Chordates have a notochord at some stage of their life cycle, which may be replaced by a backbone in vertebrates. Non-chordates do not have a notochord and use other structures such as exoskeletons or hydrostatic skeletons for support. Other differences include the position and complexity of the nerve cord, the mode of respiration, the type of blood circulation, the presence of haemoglobin, the number of germ layers, the symmetry, the coelom, the tail, and the regeneration ability. Examples of chordates are mammals, birds, reptiles, amphibians, and fish. Examples of non-chordates are arthropods, molluscs, annelids, nematodes, cnidarians, and poriferans.

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