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Which trait was most important in the development and advancement of modern fish?

A) a lower jaw
B) eggs with shells
C) 4-chambered heart
D) live birth of young

Respuesta :

megthesmolbean
A. a lower jaw. hope this helps

Answer: Option A - A lower jaw.

Explanation:

  • The earlier fishes used to be jawless (Agnathans).
  • The most important trait used in the development of advanced fishes was the development of lower jaw.
  • This lower jaw was primarily developed to facilitate the biting.
  • Later on the complete jaw was developed which facilitated first in breathing and then was utilised for feeding.