In animal kingdom ,the first organism possessing back bones:(1)fishes(2)amphibians(3)aves(4)reptiles
Answers
Answered by
1
Explanation:
fishes are those organisms
Answered by
0
In animal kingdom, the first organisms possessing backbones are fishes.
* Fishes appeared first in the Cambrian period almost 530 million years back.
* They were the first vertebrates that appeared on this planet.
* However, initially they only had a nerve cord which was the beginning of evolution to develop into vertebrates.
* In the Ordovician period, fishes evolved and developed a complete backbone and thereby the era of vertebrates started.
Similar questions