Why do you think it’s important for scientists to study earth’s past climates? what information are scientists likely to gain from investigating the earth’s past? since the data obtained by paleoclimatologists is not based on direct observations, can their discoveries and models be trusted? why or why not?

Which revelation resulted from the observation of the spectrum of different galaxies? a. there were more galaxies whose spectrum was blueshifted b. there were no galaxies whose spectrum was redshifted c. there were more galaxies whose spectrum was redshifted d. there were no galaxies whose spectrum was blueshifted