Before then, the vertebrate world was a lot more crowded. In the ancient vertebrate world, during the Silurian Period (443.7-419.2 MA) for example, the ancestors of modern vertebrates swam alongside ...

Long before the first dinosaur hatched, Earth's ancient life was already thriving. There were bizarre sea creatures and lumbering plant-eaters that ruled prehistoric landscapes for hundreds of ...

In the ancient vertebrate world, during the Silurian Period (443.7-419.2 MA) for example, the ancestors of modern vertebrates swam alongside spiny pseudo-sharks (acanthodians), fishy ...

In the ancient vertebrate world, during the Silurian Period (443.7-419.2 MA) for example, the ancestors of modern vertebrates swam alongside spiny pseudo-sharks (acanthodians), fishy sarcopterygians, ...

Object Details Author Gradstein, F. M Ogg, James G (James George) 1952- Smith, A. Gilbert (Alan Gilbert) 1937- Notes One folded ill. in pocket. Contents Introduction / F.M. Gradstein -- ...

Before then, the vertebrate world was a lot more crowded. In the ancient vertebrate world, during the Silurian Period (443.7-419.2 MA) for example, the ancestors of modern vertebrates swam alongside ...

Friday the 13th was a lucky day this June for the southwest Iowa city of Avoca, pop. 1,700. Restaurants along Main Street had ...

Sometimes a short period cycle is a natural variation, but it can also indicate a medical condition. Learn more about the causes of a short cycle.

Period drama fans can’t get enough of one BBC six-part series based on a beloved book. Adapted from a true story, the drama is set in the eighteenth century and follows four high-born sisters ...

The incubation period for the coronavirus is between 2 and 14 days. On average, COVID-19 symptoms appear around 5 days after exposure, but this can vary. Learn more.