Examlex
Changes in blood flow to the brain are related to ______ headaches.
Non-Avian Dinosaurs
The group of dinosaurs that did not evolve into birds and became extinct approximately 66 million years ago.
Mass Extinctions
Events in Earth's history when a significant, widespread and rapid decrease in the biodiversity of organisms occurs, often due to drastic environmental changes.
Mass Extinction
A significant and widespread event in which a substantial proportion of Earth's species die out in a relatively short geological period.
Climate Change
Substantial changes in global or regional climate patterns, notably since the late 20th century, largely attributed to increased levels of atmospheric carbon dioxide produced by fossil fuels.
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