How can you prove that the universe is expanding? how can you prove that the universe is expanding?

you can prove the universe to be expanding by observing the cosmological redshift or by using Albert Einstein’s General Relativity theory

eukarya because is is like alche and b is bacteria and d is animals

explanation:

the alkaline earth metals (beryllium (be), magnesium (mg), calcium (ca), strontium (sr), barium (ba), and radium (ra)) are a group of chemical elements in the s-block of the periodic table with very similar properties: shiny. silvery-white. hopefully this ? i didn't fully understand the question