Question

In vertebrates, metamerism is?

• A. Both external and internal
• B. External only
• C. Internal only
• D. External in certain regions and internal in others

Answer 1

The correct option is C Internal only

• Metamerism is the phenomenon of having a linear series of body segments similar in structure. All the segments are not entirely similar because some of them perform special functions.
• The vertebrates show an internal metamerism of body muscles, nerves, certain blood vessels, vertebrate and ribs.
  
• Hence In vertebrates, metamerism is internal only.
• So, the correct answer is 'Internal only'.