Answer the following question given this paragraph: Like all chordates, vertebrates are animals with four defining traits, at least during the embryonic stage. The four traits are:. Q: Like all chordates, vertebrates are animals with four defining traits, at least during which stage? Choices: - pupal - larval - adult - embryonic A:
embryonic
Answer the following question given this paragraph: Figure 4.22 Microfilaments thicken the cortex around the inner edge of a cell; like rubber bands, they resist tension. Microtubules are found in the interior of the cell where they maintain cell shape by resisting compressive forces. Intermediate filaments are found throughout the cell and hold organelles in place. Q: What thickens the cortex around the inner edge of a cell? Choices: - mitochondria - vacuoles - plasma membrane - microfilaments A:
microfilaments
Q: Answer the following question given this paragraph: One way to keep iron from corroding is to keep it painted. The layer of paint prevents the water and oxygen necessary for rust formation from coming into contact with the iron. As long as the paint remains intact, the iron is protected from corrosion. Other strategies include alloying the iron with other metals. For example, stainless steel is mostly iron with a bit of chromium. The chromium tends to collect near the surface, where it forms an oxide layer that protects the iron. Zinc-plated or galvanized iron uses a different strategy. Zinc is more easily oxidized than iron because zinc has a lower reduction potential. Since zinc has a lower reduction potential, it is a more active metal. Thus, even if the zinc coating is scratched, the zinc will still oxidize before the iron. This suggests that this approach should work with other active metals. Another important way to protect metal is to make it the cathode in a galvanic cell. This is cathodic protection and can be used for metals other than just iron. For example, the rusting of underground iron storage tanks and pipes can be prevented or greatly reduced by connecting them to a more active metal such as zinc or magnesium (Figure 17.18). This is also used to protect the metal parts in water heaters. The more active metals (lower reduction potential) are called sacrificial anodes because as they get used up as they corrode (oxidize) at the anode. The metal being protected serves as the cathode, and so does not oxidize (corrode). When the anodes are properly monitored and periodically replaced, the useful lifetime of the iron storage tank can be greatly extended. Q: Zinc is more easily oxidized than iron because zinc has a lower reduction potential. since zinc has a lower reduction potential, it is a more what? Choices: - much metal - Trap metal - usually metal - active metal A:
A: active metal
Question: Answer the following question given this paragraph: Beneath the crust is the mantle . The mantle is made of hot, solid rock. They know this because of seismic waves, meteorites, and the heat that comes from inside the planet. Mantle rock is mostly peridotite , which is rich in iron and magnesium ( Figure below ). Peridotite is rare at Earth's surface. Q: Made of hot, solid rock, the mantle is beneath what layer of the earth? Choices: - liquid - volcanic - core - crust A:
Answer: crust
*Question*
Answer the following question given this paragraph: Most groundwater does not flow out of an aquifer as a spring or geyser. So to use the water that's stored in an aquifer people must go after it. How? They dig a well. A well is a hole that is dug or drilled through the ground down to an aquifer. This is illustrated in Figure below . Q: How can people access water in an aquifer that does not flow from a spring or a geyser? Choices: - mound building - generate electricity - evaporation - dig a well A:
**Answer**
dig a well
*Question*
Answer the following question given this paragraph: REVIEW QUESTIONS 2. Magnesium has an atomic number of 12. Which of the following statements is true of a neutral magnesium atom? a. Q: What is the atomic number of magnesium? Choices: - 17 - 25 - 8 - 12 A:
**Answer**
12