Q: What is the term for a galaxy that is a rotating disk of stars and dust? Read this paragraph and choose the correct option from the provided answers: A spiral galaxy is a rotating disk of stars and dust. In the center is a dense bulge of material. Several spiral arms come out from the center. Spiral galaxies have lots of gas and dust and many young stars. The image below ( Figure below ) shows a spiral galaxy from the side. You can see the disk and central bulge. Choices: - cosmic galaxy - nebula - Milky Way - spiral galaxy A:
spiral galaxy

Q: What happened to earth's species during the permian period? Read this paragraph and choose the correct option from the provided answers: The Permian Period ended with Earth's second mass extinction. During this event, most of Earth's species went extinct. It was the most massive extinction ever recorded. It's not clear why it happened. One possible reason is that a very large meteorite struck Earth. Another possibility is the eruption of enormous volcanoes. Either event could create a huge amount of dust. The dust might block out sunlight for months. This would cool the planet and prevent photosynthesis. Choices: - evolution - duplication - division - mass extinction A:
mass extinction

Q: Through what method or methods of fertilization do amphibians sexually reproduce? Read this paragraph and choose the correct option from the provided answers: Amphibians reproduce sexually with either external or internal fertilization. They may attract mates with calls or scents. They do not produce amniotic eggs, so they must reproduce in water. Their larvae go through metamorphosis to change into the adult form. Choices: - asexual or sexual - mitosis and meiosis - spawning or budding - external or internal A:
external or internal