By Will Dunham (Reuters) - For human beings and 99.8% of our fellow vertebrates, having jaws is an integral part of life. Just try eating a taco witho.
The composition of the Earth's continents abruptly changed due to the evolution of land plants, according to researchers at the University of Southampton.
Cambrian explosion, the unparalleled emergence of organisms between 541 million and approximately 530 million years ago at the beginning of the Cambrian Period. The event was characterized by the appearance of many of the major phyla (between 20 and 35) that make up modern animal life. Many other