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Hadrosaurus
Hadrosaurus is a hadrosaurid dinosaur genus. In 1858, a skeleton of a dinosaur from this genus was the first full dinosaur skeleton found in North America, and in 1868 it became the first ever ... > more -
Cretaceous-Tertiary extinction event
The Cretaceous-Tertiary extinction event was a period of massive extinction of species, about 65.5 million years ago. It corresponds to the end of the Cretaceous Period and the beginning of the ... > more -
Radiocarbon dating
Radiocarbon dating is a radiometric dating method that uses the naturally occurring isotope carbon-14 to determine the age of carbonaceous materials up to ca 60,000 years. Within archaeology it is ... > more -
Triceratops
Triceratops, meaning "three-horned face", because it had three horns was a ceratopsid herbivorous dinosaur genus from the Latest Cretaceous period of what is now North America. It lived at around the ... > more -
Microorganism
A microorganism or microbe is an organism that is so small that it is microscopic (invisible to the naked eye). Microorganisms are often illustrated using single-celled, or unicellular organisms; ... > more -
Plate tectonics
Plate tectonics is a theory of geology developed to explain the phenomenon of continental drift and is currently the theory accepted by the vast majority of scientists working in this area. In the ... > more -
Structural alignment
Structural alignment is a form of sequence alignment based on comparison of shape. These alignments attempt to establish equivalences between two or more polymer structures based on their shape and ... > more -
Pelycosaur
The pelycosaurs were smallish to large (up to 3 meters or more) primitive Late Paleozoic synapsid reptiles. They appeared during the Late Carboniferous and reached their acme in the early part of the ... > more -
Precambrian
The Precambrian is an informal name for the eons of the geologic timescale that came before the current Phanerozoic eon. It spans from the formation of Earth around 4500 Ma (million years ago) to the ... > more
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