Answer the following question given this paragraph: 

Two planets are on a collision course, heading directly towards each other at 0.250c . A spaceship sent from one planet approaches the second at 0.750c as seen by the second planet. What is the velocity of the ship relative to the first planet? 28. When a missile is shot from one spaceship towards another, it leaves the first at 0.950c and approaches the other at ships?.


Q: Spinal cord injuries are notoriously difficult to treat because spinal nerves do not do what?


A:
regenerate