Which statements accurately describe the Doppler effect? Select three options.

a. It is used to learn about the behavior of the universe.

b. It was used by Hubble to measure velocities of galaxies.

c. It indicates galaxy motion through light wavelengths.

Explanation:

answer; i believe that the correct answer is (light);

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs