Biology, asked by RinoyR4586, 10 months ago

In animal kingdom ,the first organism possessing back bones:(1)fishes(2)amphibians(3)aves(4)reptiles

Answers

Answered by ilasankari
1

Explanation:

fishes are those organisms

Answered by orangesquirrel
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.

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