Today it represents something quite different: a set of extraordinary clues, recently reinterpreted, to one of the deepest and most puzzling mysteries of life on Earth. After burbling along for ...

However, a new study from the University of Geneva suggests that the egg could in fact predate all animal life. A ...

The first life forms to appear on Earth were unicellular, i.e. composed of a single cell, such as yeast or bacteria. Later, animals -- multicellular organisms -- evolved, developing from a single ...

dramatically. It was the time of the Cambrian Explosion, an eruption of life when Earth’s very first animals began appearing in the fossil record — the ancestors of all major animal groups ...