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The living jawless vertebrates belong to the class

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a

Ostracoderms

b

Cytoplasm

c

Placoderms

d

Chondrichthyes

answer is B.

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Detailed Solution

Concept- The term "cytoplasmic" refers to the group of living vertebrates without a jaw. Lampreys from hagfish are a great illustration of cytoplasms. Vertebrates originally appeared about 625 million years ago. The earliest known vertebrate is the myelin fulale. In the late Devonian epoch, the earliest jawed vertebrates first appeared, and they were common during this period. The cytoplasm is a thick solution that fills each cell and is enclosed by the cell membrane. Consequently, the Devonian era is sometimes called the "age of fishes."
Hence, option 2 is the correct answer.

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