How do scientists use the doppler effect to measure the actual motion of stars?

Doppler effect works using sound waves as well as light waves. It is used in studying the motion of objects in the Universe such as galaxies, planets as well as the stars. If things are moving toward someone it means wavelengths are being shortened.

1. true.2. true.3. true.4. false.5. true.the concept of darwin's theory of evolution involves the idea that there are limited resources in a given living environment and that the organisms which live within have variations in their genetic make up due to random mating. the ones with beneficial genetic variations can express certain traits which give them an upper hand in surviving and reproducing in the said environment compared to ones who may have a more disadvantageous variation in traits. over time, the organisms with an upper hand will survive and reproduce more frequently and pass on their beneficial genes while the others die. the result is evolution, where we observe (usually, but not always) eventually, phenotypic distinct changes.