Brainiest if its correct What phenomenon was discovered by early astronomers and used by Hubble to confirm that the universe is expanding?

The light emitted by the galaxies becomes brighter as they move away from one another.

The wavelength of the light emitted by the galaxies shifts to the blue region of the spectrum as the galaxies move away from one another.

The wavelength of the light emitted by the galaxies shifts to the red region of the spectrum as the galaxies move away from one another.

The light emitted by the galaxies becomes whiter as they move away from one another.

Describe the particles of all three phases of matter in the root beer float. (how are the particles arranged and moving? )

Omg imgonnafailnfiedkla use complete sentences to explain how the mass of hydrogen is conserved during cellular respiration.

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.