Tamara Harris of the National Institute on Aging, because other activities, such as free-radical oxidation and possibly telomere shortening, also contribute to the body's slow decline.
Meanwhile, across the entire island, many moai are reversing the creation process and deteriorating rapidly from priceless carvings back into plain rock.
Increases in seeds from pioneer plants and systematic changes in the animals hunted and the trees used for construction and fuel are evidence of environmental degradation.
Teeming , environmentally degraded , ravaged by poverty , hunger , HIV/AIDS and civil war , Africa appears the most plausible candidate ever to suffer a Malthusian disaster .
Increases in seeds from pioneer plants and systematic changes in the animals hunted and the trees used for construction and fuel are evidence of environmental degradation.
The gradual drying of the soil caused by its diminished ability to absorb water results in the further loss of vegetation, so that a cycle of progressive surface deterioration is established.
We've been talking about the decline of coral reefs in tropical areas all over the world—how natural and man-made stresses are causing them to degrade or in some cases, to die.
One thing that physiologists have learned is that without gravity our bodies begin to lose strength, leaving astronauts with weakened bones, muscles and cardiovascular systems.
The numerical effect is obvious: there are fewer salmon in degraded regions than in pristine ones; however, habitat loss also has the potential to reduce genetic diversity.