How long did it take for the earth to form after the big bang?

The number of living organisms in a particular area is

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. the following chemical equation shows the combustion of ethane. balance the equation by filling in the coefficients. c2h6 + o2 → co2 + h2o

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?