Explains how dinosaurs first came to exist by way of their amphibian relatives, as well as how they were able to adjust and develop into a wide variety of species during massive global changes over millions of years.
ThriftBooks sells millions of used books at the lowest
everyday prices. We personally assess every book's quality and offer rare, out-of-print treasures. We
deliver the joy of reading in recyclable packaging with free standard shipping on US orders over $15.
ThriftBooks.com. Read more. Spend less.