By Julie Lundgren
Early Readers find out about varied Animal Habitats.
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Extra info for Animal Habitats
Wherever such tests have been carried out, these conditions have been confirmed. A good example is provided by the mammalian populations of North and South America, where strikingly different endemic forms evolved in isolation until the emergence of the isthmus of Panama approximately three million years ago. Thereafter, the armadillo, porcupine and opossum—mammals of South American origin—migrated north, along with many other species of plants and animals, while the mountain lion and other North American species made their way across the isthmus to the south.
If a drop of the antibiotic streptomycin is added to the culture, most bacteria will die, but after a day or two the culture will again teem with billions of bacteria. How come? e. nonresistant) bacteria randomly, at rates in the order of 1 in 100 million bacterial cells. In a bacterial culture with 20 to 30 billion bacteria, we expect between 200 and 300 bacteria to be resistant. When streptomycin is added to the culture, only the resistant cells survive. The 200 or 300 surviving bacteria will reproduce, and allowing one or two days for the necessary number of cell divisions, 20 billion or so bacteria are produced, all resistant to streptomycin.
Com. com THE BIG QUESTIONS Evolution Francisco J. Ayala is University Professor and Donald Bren Professor of Biological Sciences and Professor of Philosophy at the University of California, Irvine. He is a member of the National Academy of Sciences (NAS), a recipient of the 2001 National Medal of Science, and served as Chair of the Authoring Committee of Science, Evolution, and Creationism, jointly published in 2008 by the NAS and the Institute of Medicine. He has written numerous books and articles about the intersection of science and religion, including Darwin’s Gift to Science and Religion and Am I a Monkey?.