Biology 1st Edition by Jerome Krueger, Kendra Hill, Robert Noyd

تمرين 20

An extended global cold period called the Younger Dryas occurred about 12,800 years ago, a time when humans were becoming established in North America. One hypothesis links the onset of the Younger Dryas to humans hunting to extinction 114 large species of herbivorous animals such as mammoths, which produced large quantities of methane ( Fig. ). Explain why this hypothesis has a scientific basis and could be true.
Figure Mammoths.