Word: mammalian
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...believe are the first known odor receptors -- individual genes that are active in the nose and nowhere else in the body. What is more, the molecules they found seem to be part of an extended family of smell genes -- perhaps the largest single family in the long strand of mammalian DNA. "We have identified a few hundred genes," says Richard Axel, a professor at Columbia's Howard Hughes Medical Institute. "And there is reason to suspect there may be as many as a thousand...
...mammalian excreta per lb., on average
This frame of mind hampered my exam performance. As I struggled to remember the inner working of the mammalian kidney, my mind rattled off 12 different ways to make the layout of the exam more visually pleasing. "Times font would have been most appropriate for this question," I thought to myself. "Why didn't they use boldface for contrast...
That progress encompasses both flora and fauna. Inside the boundaries of the monument, where by law people are not allowed to assist regeneration, a mammalian equivalent of the bulldozer has been the pocket gopher. Colonies of these tiny industrious burrowers have helped mix the nutrient-poor ash and pumice with rich, pre-eruptive soil, creating a more hospitable turf for windblown seeds. Deer mice, ants and beetles have also assisted in the regeneration of the soil. Flowering lupine, with root nodules that convert nitrogen into compounds necessary for plant growth, has seized a foothold on the pumice plain, along with...
...years ago, pulverizing a huge area and spewing so much debris into the atmosphere that the skies darkened for months, temperatures dipped, and much of the life on earth--most notably the dinosaurs--perished. It was the demise of the dinosaurs, many evolutionists believe, that enabled man's tiny mammalian ancestors to emerge from hiding, occupy the environmental niches left vacant by the great beasts and other destroyed species, and evolve into Homo sapiens. Impacts by comets may have been responsible for mass ! extinctions of life at other times in the past. And scientists are certain that it can happen...