By SAMUEL MARTINEZ, age 12
DNA analysis of arctic vegetation suggests that a lack of proper food may have been a major contribution to the extinction of the woolly mammoth. Scientists found that forbs (flowering herbs) such as sagebrush and yarrow were disappearing around 10,000 years ago. Easier to digest than grass, these may have been a main source of protein for the mammoths. Some researchers caution that this may not be the right explanation, as the results are preliminary.