Answer:
1. During the Cretaceous-Paleogene extinction approximately _______ of all life forms on Earth became extinct.
2. The Cenozoic Era mass extinction of many animals gave an opportunity for _______ to fill the ecological positions that had previously been filled by dinosaurs.
3. Primates and early humans appeared later during the Neogene and _______ Periods.
4. The Cenozoic Era experienced a series of ice ages, and specifically during the _______ ice ages the glaciers advanced and retreated four times.
5. The Cascade Mountains were formed in the Cenozoic by the geologic process of _______ along the western edge of North American continent.
Respond to the following based on your reading.
6. Describe how life was affected on Earth during the Cretaceous Period when an asteroid struck the Yucatan Peninsula in Mexico.
Explanation:
1. 75%
2. Mammals
3. Paleogene
4. Pieitocene
5. Subduction
6. The impact from the asteroid created large amounts of dust and ash in the atmosphere, blocking sunlight and reducing temperatures on Earth’s surface. The decreased sunlight stopped plants from photosynthesis, causing a major disruption in the food chain. Many herbivores and their predators went extinct.
