In this task, you will be presented with a context passage, a question about that paragraph, and a possible answer to that question. The task is to check the validity of the answer. Answer with "Yes" or "No".

[EX Q]: Fossils can be used to match up rock layers. As organisms change over time, they look different. Older fossils will look different than younger fossils. Some organisms only survived for a short time before going extinct. Knowing what organisms looked like at certain times also helps date rock layers. Some fossils are better than others for this use. The fossils that are very distinct at certain times of Earths history are called index fossils. Index fossils are commonly used to match rock layers. You can see how this works in Figure 2.30. If two rock layers have the same index fossils, then they're probably about the same age. <sep>What kind of fossils are used to date rock layers?<sep>Index fossils
[EX A]: Yes

[EX Q]: A flood occurs when a river overflows its banks. This might happen because of heavy rains. Floodplains In very flat regions, flood water may spread out on the surface of the land. It then slows down and drops its sediment. If a river floods often, a floodplain develops. A floodplain is an area where a thick layer of rich soil is left behind as the floodwater recedes. Thats why floodplains are usually good places for growing plants. They are very flat areas and they have very rich soils. The Nile River valley is a great example of a floodplain. Each year, the Nile River rises over its banks. This floodwater carries a lot of sediment. This sediment has been eroded off areas of land from upstream. This sediment is dropped as the water slows down after spreading across the land. What is left behind is a very rich soil. Thats why crops can be raised in the middle of a sandy desert. Natural Levees A flooding river often forms natural levees along its banks. A levee is a raised strip of sediments deposited close to the waters edge. <sep>What may cause a river to flood and overflow its banks?<sep>Upstream erosion
[EX A]: No

[EX Q]: Nine families displaced by a fire at Alamo Hills Apartments in March filed lawsuits Wednesday against the apartment complex. They allege that the complex could have done more to protect belongings they were forced to abandon in the aftermath of the blaze. Bernard Dempsey Jr., an attorney with Western Michigan Legal Services, the group that represents the tenants, said Alamo Hills gave the displaced families very limited opportunity to remove belongings. "They were given three days to get their stuff out, and if they couldn't get moved out in three days, their stuff was discarded," Dempsey said. "Alamo Hills just threw it out." Others, he said, lost possessions to looters after the March 23 blaze, which left 78 people temporarily homeless. According to the lawsuit, the tenants were prohibited from entering their apartments to retrieve possessions and were promised that the complex would provide security. A spokesperson for PM One, the company that manages Alamo Hills, could not be reached for comment. Nine separate suits were filed in 8th District Court, which handles civil claims of less than $25,000. "We're asking for the reimbursement of the value of their property and a small amount for stress -- $3,000 on top of their out-of-pocket expenses for their lost stuff," Dempsey said. "They're not looking to get rich off this. A lot of this is simply because they were treated so badly." Dempsey said most of the tenants who filed suits still live at the apartment complex, although many are trying to find homes elsewhere. "The new apartments (they were provided) were not in very good shape. That's actually one of the claims," he said. <sep>What are the nine families asking for in their lawsuits?<sep>The tenants were prohibited from entering their apartments to retrieve possessions and were promised that the complex would provide security
[EX A]:
Yes

