Word: ratio
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Dates: during 1990-1999
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...high carbon-to-nitrogen ratio in these plants means that they are nitrogen-deficient, because a greater amount of nitrogen is needed to sustain the larger plant...
Secondly, Bazzaz has shown in experiments that butterfly larvae that eat leaves with a higher carbon-to-nitrogen ratio than normal are more prone to death. They have a higher mortality rate and grow less than larvae that eat leaves grown from a nitrogen-rich environment. Consequently, insect populations will go down, which in turn may upset the food chain...
...students who seek help at Mental Health Services, women outnumber men, two to one. At the Bureau of Study Council, the ratio is three to two. And over the years slightly more women than men have used Room 13. Catlin attributes the discrepancy to differences in the way men and women tend to address personal problems...
...only time male students do not dominate discussions is when the teacher is female and the ratio of male to female students is equal, Shinagel said...
...than-usual cohort that delayed the decision too long: an unprecedented number of infertile couples are in the adoption marketplace. There are an average of four eager U.S. couples for each of the 50,000 domestic-born children placed in new homes each year; some adoption advocates put the ratio as high as 20 to 1. U.S. couples on an adoption-agency waiting list can wait as long as five years for a white newborn...