They all develop gills, slits and tails
The answer is A. because it basically forms like a bony cage for the lungs and heart, keeping it safe and protected.
No because it doesn’t exist you put no photo. I can help if you tell me in comments tho
The vertebrae form a column with a cavity called the vertebral canal.
A part of the central nervous system, the spinal cord is located inside this canal, so this canal is often called the spinal canal. Trough the openings in the canal the spinal nerves go to different parts of the body that they innervate.
Answer:
Parasitism
Explanation:
A symbiotic relationship between two species in which one benefits and the other is harmed
