[Solved] Dr.Eden studies the fetus's sensitivity to external stimuli by measuring changes in fetal heart rate when various repeated sounds are presented,followed by a different sound.Dr.Eden is probably using __________. A) imitation B) extinction C) habituation and recovery D) classical conditioning 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.