[Solved] How does vitamin E function as an antioxidant? End-Cretaceous Extinction: A significant global extinction event approximately 66 million years ago, marking the end of the Cretaceous Period, characterized by the mass extinction of dinosaurs among other species. Asteroid Impact: A phenomenon where an asteroid collides with another celestial body, such as Earth, potentially causing significant geological and biological effects. Carbonate Rock: Sedimentary rocks, such as limestone, that are composed primarily of carbonate minerals. Microscopic Organisms: Tiny life forms, often unicellular, that are not visible to the naked eye and require a microscope to be observed.