By B. Moskowitz
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Extra resources for Fundamental Physical Constants, Conversion Factors (geophysical) [short article]
Example text
But what is now apparent—both from ecological studies of island plants and animals and from genetic studies of island peoples—is that many of the changes in genetic frequencies do not proceed as slowly as Darwin or even Wallace had assumed. 5 million years ago during the emergence of the genus Homo, nor were they fixed during the period when mitochondrial Eve roamed the savannas of East Africa between 150,000 and 200,000 years ago. They have been constantly reshaped by the peculiar range of food choices, environmental stresses, and diseases that humans face in every place in which they have spent considerable time; and, of course, our reactions 50 why some like it hot continue to be reshaped by our present food choices and disease exposures as well.
From Darwin’s finches to toads in the Caribbean, measurable change in animals’ morphology, anatomy, and behavior are now known to have occurred within the sight (and lifetimes) of a single cohort of biologists. Under intensive selection pressure, faunal populations have differentiated into distinct subspecies and populations in a matter of a few generations. Others have called this emerging field nutritional anthropology, while a few scientists see it as a subset of chemical ecology—the study of how secondary compounds affect food chains.
They do not belong to either Java Man or Mr. Upright; instead, they appear to have served a now-extinct orangutan species in his masticatory pursuits. Nonetheless, the highlands of the East Indies had proven to be fertile ground for studies of our evolutionary history. When I first traveled to the East Indies, I was constantly trying to determine what foods Java Man may have been exposed to that might still occur on the islands, and what might have changed in the meantime. Within hours of landing on Bali, I was able to travel by bus to a tropical beach where I could scan the eastern horizon for the coastal searching for the ancestral diet 43 cliffs and volcanic summits of Java.