In which type of relationship do both species always benefit? mutualism symbiosis commensalism competition

Mutualism  is the Relationship were they both benefit.

Your answer is A, Mutualism. Hope It Helps!

This phenomena is simply because the galaxies are VERY far away. Light though moving at a very high speed has a finite speed so it takes time for light to get to use. (8 second from the sun) because of this these galaxies are so far away that light they emitted all that time ago is reaching us now..