Biological losses and the quarantine policy for Mars.
D055580:Astronomical Phenomena; D001256:Astronomy; D005118:Extraterrestrial Environment; D006801:Humans; D008433:Mathematics; D008962:Models, Theoretical; D011336:Probability; D011790:Quarantine; D013026:Space Flight / Q000592:standards*; D013170:Spores / Q000254:growth & development; D013997:Time Factors; D014481:United States