*Question*
Q: What is used during every step of oil production, from exploration to distribution? Read this paragraph and choose the correct option from the provided answers: Consider petroleum as an example. Oil companies explore for petroleum in areas where they think it might be. When they find it, they must determine how much is there. They must also know how hard it will be to get. If there's enough to make it worthwhile, they will decide to go for it. To extract petroleum, companies they must build huge rigs, like the one in Figure below . An oil rig drills deep into the ground and pumps the oil to the surface. The oil is then transported to a refinery. At the refinery, the oil is heated. It will then separate into different products, such as gasoline and motor oil. Finally, the oil products are transported to gas stations, stores, and industries. At every step, energy is used. For every five barrels of oil we use, it takes at least one barrel to get the oil. Choices: - coal - robots - water - energy A:
**Answer**
energy

*Question*
Q: All members of a species living together form a what? Read this paragraph and choose the correct option from the provided answers: Recall that the four different sublevels (s, p, d, and f) each consist of a different number of orbitals. The s sublevel has one orbital, the p sublevel has three orbitals, the d sublevel has five orbitals, and the f sublevel has seven orbitals. In the first period, only the 1s sublevel is being filled. Since all orbitals can hold two electrons, the entire first period consists of just two elements. In the second period, the 2s sublevel, with two electrons, and the 2p sublevel, with six electrons, are being filled. Consequently, the second period contains eight elements. The third period is similar to the second, except the 3s and 3p sublevels are being filled. Because the 3d sublevel does not fill until after the 4s sublevel, the fourth period contains 18 elements, due to the 10 additional electrons that can be accommodated by the 3d orbitals. The fifth period is similar to the fourth. After the 6s sublevel fills, the 4f sublevel is populated with up to 14 electrons. This is followed by the 5d and the 6p sublevels. The total number of elements in the sixth period is 32. The seventh period also contains 32 elements, most of which are too unstable to be found in nature. All 32 have been detected or synthesized, although for some of the later elements in this period, only a handful of atoms have ever been made. Choices: - family - group - organization - population A:
**Answer**
population

*Question*
Q: Frogs and toads, salamanders and newts, and caecilians are the three orders of what group of animals? Read this paragraph and choose the correct option from the provided answers: There are about 6,200 known species of living amphibians. They are classified into three orders: frogs and toads, salamanders and newts, and caecilians. Choices: - marsupials - reptiles - mammals - amphibians A:
**Answer**
amphibians

*Question*
Q: Worms use a hydrostatic type of what anatomical structure to move through their environment? Read this paragraph and choose the correct option from the provided answers: Choices: - gastrointestinal system - head - tail - skeleton A:
**Answer**
skeleton