General characteristics of chordate
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Noton; back and chorda; cord).
Kingdom: Animalia.
Presence of a notochord.
They are backboned animals (vertebrates),
Most of the living chordates are familiar vertebrate animals.
Presence of dorsal hollow nerve cord.
Blood vascular system: Present, closed type.
Ventral heart, hepatic portal system and RBC are present.
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Because the nostrils are smaller than the mouth, air exhaled through thenose creates a back flow of air (and oxygen) into the lungs. And becausewe exhale more slowly through thenose than we do though the mouth, the lungs have more time to extract oxygen from the air we've already taken in.
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