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Exponential growth in the Canadian migratory population of the whooping crane after 70 years of cons
During drought years on the Galapagos, small, easily eaten seeds become rare, le
H. erectus migrated out of Africa beginning about 1.8 million years ago and is first known from Geor
Atmospheric CO2 Concentrations Increased Very Rapidly during the Last 200 Years
Step-Wise Treatment of Asthma in Children > 12 Years of Age and Adults
In Canada, 2/3 women and over 1/2 of men 55 to 64 years of age are grandparents