1. Why are there few quasars at low redshifts and at high redshifts but many at redshifts between…

1. Why are there few quasars at low redshifts and at high redshifts but many at redshifts between about 2 and 3? 2. How Do We Know? Classification helped Darwin understand how creatures evolve. How has classification helped you understand how galaxies evolve? 3. How Do We Know? How would you avoid selection effects if you were taking a survey of the kinds of wild flowers found in a meadow?  

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