Explain primitive, degenerate, and advanced characters of Branchiostoma. Comment on its systematic position. (UPSC 2017, 15 Marks, )

ब्रैंचियोस्टोमा के आदिम, अपक्षयित और उन्नत लक्षणों की व्याख्या करें। इसकी प्रणालीगत स्थिति पर टिप्पणी करें। (Explain primitive, degenerate, and advanced characters of Branchiostoma. Comment on its systematic position.)

Explain primitive, degenerate, and advanced characters of Branchiostoma. Comment on its systematic position. (UPSC 2017, 15 Marks, ) EN ह function dochangelang(val) { if (val != "") { window.location = val; } }

Explain primitive, degenerate, and advanced characters of Branchiostoma. Comment on its systematic position. (UPSC 2017, 15 Marks, )