2. Expressing Viewpoints Some communities are enacting laws that require a certain
percentage of land in new developments to be
conserved. Do you think this is a good idea?
Why or why not?

Select the correct answer. what was edwin hubble's contribution to the field of astronomy? a. he discovered variable stars. b. he proved that the heliocentric model accurately described our solar system. c. he found a relationship between the period luminosity and distance of stars. d. he proved that the universe is finite. e. he discovered that the universe was expanding.