Which of the following statements with respect to Cyclostomata is wrong?

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Their digestive system includes the stomach, food pipe, and intestines.

Their circulatory system is closed with a two-chambered heart.

Lamprey and hagfish are examples of this class.

Their vertebral column is made of cartilage.

answer is B.

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Detailed Solution

Cyclostomes are jawless vertebrates that have an elongated, eel-like body. They include the lampreys and hagfishes.

In their digestive system, the stomach is missing, and the esophagus (food pipe) connects directly to the intestine.

Its vertebral column is made up of cartilage.

The circulatory system is closed, with a two-chambered heart.

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