Examlex
The playwright who was elected president of Czechoslovakia in 1990 was
First Organisms
The first organisms refer to the earliest forms of life on Earth, which are believed to be simple, single-celled organisms that appeared billions of years ago.
Trilobites
Extinct marine arthropods with a hard exoskeleton, which lived between the Cambrian and Permian periods, serving as important index fossils.
K-P Boundary
The K-Pg (Cretaceous-Paleogene) Boundary marks the mass extinction event about 66 million years ago that led to the extinction of the dinosaurs and many other species.
Meteorite Impact
The collision of a meteorite with the Earth's surface, causing crater formation and often leading to significant geological changes.
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