The teeth of some mammals show "growth rings" that result from the constant depositing of layers of cementum as opaque bands in summer and translucent bands in winter. Cross sections of pigs' teeth found in an excavated Stone Age trash pit revealed bands of remarkably constant width except that the band deposited last, which was invariably translucent, was only about half the normal width. The statements above most strongly support the conclusion that the animals died ['in an unusually early winter', 'from starvation', 'roughly in midwinter', 'at roughly the same age']