have the highest rates of star formation The largest individual galaxies in the universe are known as .
The collective activity of many supernova events in a relatively small volume of a galaxy can create .
The energy for all active galactic nuclei is thought to come from in-fall of matter into .
are often characterized by sources of immense energy located hundreds of thousands of light-years away on either side of their centers.

a

explanation:

because they are cartillidge

b mirrors submit a iisner? e. for which optical devices does d sometimes have a positive value? o a a and b o b. a and c o c. b and d 0 d. b and cb

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement