Answer the following question given this paragraph: We have talked about the activity and decay of individual isotopes. In the real world, there is a decay chain that takes place until a stable end-product is produced. For U-238, the chain is a long one, with a mix of isotopes having very different half-lives. The end of the chain resides in lead, a stable element that does not decay further. Q: What is required for a decay chain to end? Choices: - stable half-life - unstable end-product - radioactive cascade - stable end-product A:
stable end-product
Answer the following question given this paragraph: The umbra is the part of the shadow in which light is completely blocked. Q: The part of the shadow in which light is completely blocked is called what? Choices: - penumbra - eclipse - corona - umbra A:
umbra
Q: Answer the following question given this paragraph: Both flukes and tapeworms are parasites with vertebrate hosts, including human hosts. Flukes live in the host's circulatory system or liver. Tapeworms live in the host's digestive system. Usually, more than one type of host is required to complete the parasite's life cycle. Look at the life cycle of the liver fluke in Figure below . As an adult, the fluke has a vertebrate host. As a larva, it has an invertebrate host. If you follow the life cycle, you can see how each host becomes infected so the fluke can continue its life cycle. Q: Both flukes and tapeworms are parasites with what kind of host? Choices: - insect - trees - cells - vertebrate A:
A: vertebrate
Question: Answer the following question given this paragraph: Figure below shows the mix of energy resources used worldwide in 2006. Fossil fuels still provide most of the world's energy, with oil being the single most commonly used energy resource. Natural gas is used less than the other two fossil fuels, but even natural gas is used more than all renewable energy resources combined. Wind, solar, and geothermal energy contribute the least to global energy use, despite the fact that they are virtually limitless in supply and nonpolluting. Q: Which fuels provide most of the world's energy? Choices: - coal fuels - pattern fuels - artificial fuels - fossil fuels A:
Answer: fossil fuels
*Question*
Answer the following question given this paragraph: The muscles of the anterior compartment of the thigh flex the thigh and extend the leg. This compartment contains the quadriceps femoris group, which actually comprises four muscles that extend and stabilize the knee. The rectus femoris is on the anterior aspect of the thigh, the vastus lateralis is on the lateral aspect of the thigh, the vastus medialis is on the medial aspect of the thigh, and the vastus intermedius is between the vastus lateralis and vastus medialis and deep to the rectus femoris. The tendon common to all four is the quadriceps tendon (patellar tendon), which inserts into the patella and continues below it as the patellar ligament. The patellar ligament attaches to the tibial tuberosity. In addition to the quadriceps femoris, the sartorius is a band-like muscle that extends from the anterior superior iliac spine to the medial side. Q: Which muscle is a band-like muscle that extends from the anterior superior iliac spine to the medial side? Choices: - vastus medialis - tibialis anterior - soleus - sartorius A:
**Answer**
sartorius
Q: Answer the following question given this paragraph: When the number of electrons and the number of protons are equal, the object is neutral. Q: When the number of electrons and the number of protons are equal, the object is what? Choices: - Negative - Positive - static - neutral A:
A: neutral