Which statements describe dark matter? Select two options.

A:It is invisible.
B:It is the same as dark energy.
C:It is well understood by scientists.
D:It does not emit electromagnetic radiation.
E:It can be observed by shifts in red and blue light

Johnny rode his bike 4 blicks down the street to his friend's house once he got to his friend house and realized he could not cone out to play he turned aroubd and went back home. what is displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

Explain how the political influence of african americans leaders became weaker.

How dose plate tectonics effect climate