Mass Extinctions
Intervals in which a large proportion of species disappeared worldwide in a geologically short time. Five are conventionally recognised in the past…
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Intervals in which a large proportion of species disappeared worldwide in a geologically short time. Five are conventionally recognised in the past…
An extinct class of marine arthropods that existed for roughly 270 million years, left an exceptionally rich fossil record, and are among the most…
The preserved remains or traces of past life. They are the direct evidence for the history of life on Earth, and the record they form is…
Whether dinosaurs generated their own body heat, like mammals and birds, or depended on the environment, like modern reptiles, has been argued for…
A transitional fossil shows a mixture of features from an ancestral group and a descendant one. Their absence was Darwin's own stated difficulty with…
Birds are dinosaurs. The claim was regarded as fringe for most of the twentieth century, and it is now among the best supported conclusions in…
Punctuated equilibrium is a theory about the pace of evolution. It proposes that species tend to remain largely unchanged for long stretches of time,…