Of one hundred envelopes in a box, one envelope contains a $20 bill, five others each contain a $1 bill, and the rest are empty. find the probability that on the first two draws, envelopes containing money will be drawn.

Compare demographic and environmental effects of the columbian

Which evidence is most likely used to indicate the beginning of solar system formation? a. materials combined to form a mass. b. materials were pulled together by gravity. c. water condensed and collected to form oceans. d. different species of microorganisms lived on earth.

What is the famous rainforest in costa rica called?