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vovikov84 [41]
4 years ago
7

During the Ordovician period of the early Paleozoic era, the first jawless fishes appeared on Earth. These organisms belong to a

group known as _____.
A vertebrates
B mollusks
C trilobites
D corals
Biology
2 answers:
Rom4ik [11]4 years ago
5 0

Ans.

The first jawless fishes were the first fishes of earth, evolved during the Ordovician period. These fishes belong to phylum Chordata and subphylum Vertebrata, and are known as agnathans as they lack jaws. Other characteristics of jawless fishes include presence of cartilaginous skeleton, paired gill pouches, and  notochord.

Thus, the correct answer is option A). 'vertebrates.'

tatiyna4 years ago
4 0
The correct answer I believe is A - Vertebrates
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