The doppler effect indicates that the universe is expanding because
a. light from other galaxies is the same color.
b. light from other galaxies is different colors.
c. light from other galaxies is blue shifted
d. light from other galaxies is red shifted.

The diagram shows the structures of horse and cat forelimbs. what does the diagram suggest about the evolutionary relationship between these two mammals? a. they have homologous structures, indicating a common ancestor. b. they have analogous structures, indicating a common ancestor. c. they have homologous structures, indicating that they do not have a common ancestor. d. they have analogous structures, indicating that they do not have a common ancestor.

What is the mass of 4 molecules of co2

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution