Galaxies Unit Review Practice The universe's galaxies have evolved since what point in time? (1 point)
O 13.8 billion years ago, right after the universe first formed
O approximately 50 million years ago after initial clumps of material were formed
O 23 4 billion years ago, when the universe first formed
O 800 million years ago, when gas concentrations were optimal for galaxy formation

Ahydrogen atom has 1 electron. how many bonds can hydrogen form? a) 1 b) 2 c) 3 d) 4 e) 5

As air becomes more dense, (select all that apply) o. air weighs less o. gas molecules are closer together o. air is colder o. air weighs more o. gas molecules are further apart o. air is hotter

The diagrams to the right show the distribution and arrangement of gas particles in two different containers. according to kinetic-molecular theory, which of the following statements is true? check all that apply. if the temperatures of both containers are equal, container a has greater pressure than container b. if the volume of container a decreased, its pressure would decrease. if the pressure in both containers is equal, container a has a lower temperature than container b.