Which statements accurately describe the Doppler effect? Select three options.
It is used to learn about the behavior of the universe.
It was used by Hubble to measure velocities of galaxies.
It indicates galaxy motion through light wavelengths.
It indicates a galaxy moving toward Earth through red shift
It indicates a galaxy moving away from Earth through blue shift.

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population. b) the separated population is small, and genetic drift occurs. c) the isolated population is exposed to different selection pressures than the ancestral population. d) different mutations begin to distinguish the gene pools of the separated populations. e) gene flow between the two populations is extensive.