Q: As a diver descends, the increase in pressure causes the body's air pockets in the ears and lungs to do what? Read this paragraph and choose the correct option from the provided answers: from the atmosphere at sea level. As a diver descends, the increase in pressure causes the body's air pockets in the ears and lungs to compress; on the ascent, the decrease in pressure causes these air pockets to expand, potentially rupturing eardrums or bursting the lungs. Divers must therefore undergo equalization by adding air to body airspaces on the descent by breathing normally and adding air to the mask by breathing out of the nose or adding air to the ears and sinuses by equalization techniques; the corollary is also true on ascent, divers must release air from the body to maintain equalization. Buoyancy, or the ability to control whether a diver sinks or floats, is controlled by the buoyancy compensator (BCD). If a diver is ascending, the air in his BCD expands because of lower pressure according to Boyle's law (decreasing the pressure of gases increases the volume). The expanding air increases the buoyancy of the diver, and she or he begins to ascend. The diver must vent air from the BCD or risk an uncontrolled ascent that could rupture the lungs. In descending, the increased pressure causes the air in the BCD to compress and the diver sinks much more quickly; the diver must add air to the BCD or risk an uncontrolled descent, facing much higher pressures near the ocean floor. The pressure also impacts how long a diver can stay underwater before ascending. The deeper a diver dives, the more compressed the air that is breathed because of increased pressure: If a diver dives 33 feet, the pressure is 2 ATA and the air would be compressed to one-half of its original volume. The diver uses up available air twice as fast as at the surface. Choices: - heat up - expand - blow up - compress A:
compress

Q: What is the preferred method for separating late transition metals from their ores? Read this paragraph and choose the correct option from the provided answers: Hydrometallurgy is the preferred method for separating late transition metals from their ores. What types of ligands are most effective in this process?. Choices: - hydraulics - purging - heating - hydrometallurgy A:
hydrometallurgy

Q: Q: Liquid water changing to water vapor is called? Read this paragraph and choose the correct option from the provided answers: Choices: - oxidation - respiration - transpiration - evaporation A:
A: evaporation

Question: Q: In combination or synthesis reactions, two chemical species combine to produce a what? Read this paragraph and choose the correct option from the provided answers: In combination or synthesis reactions, two chemical species combine to produce a new compound. The general expression for a combination reaction is:. Choices: - fusion - mixture - alloy - new compound A:
Answer: new compound

*Question*
Q: The only obvious difference between boys and girls at birth is what type of organs? Read this paragraph and choose the correct option from the provided answers: The only obvious difference between boys and girls at birth is their reproductive organs. However, even the reproductive organs start out the same in both sexes. Choices: - digestive - respiratory - nervous - reproductive A:
**Answer**
reproductive

Q: Q: Ion pumps, the biological machines responsible for the selective transport of metal ions, are complex assemblies of what? Read this paragraph and choose the correct option from the provided answers: Ion Transport The Na+, K+, Mg2+, and Ca2+ ions are important components of intracellular and extracellular fluids. Both Na+ and Ca2+ are found primarily in extracellular fluids, such as blood plasma, whereas K + and Mg2+ are found primarily in intracellular fluids. Substantial inputs of energy are required to establish and maintain these concentration gradients and prevent the system from reaching equilibrium. Thus energy is needed to transport each ion across the cell membrane toward the side with the higher concentration. The biological machines that are responsible for the selective transport of these metal ions are complex assemblies of proteins called ion pumps. Ion pumps recognize and discriminate between metal ions in the same way that crown ethers and cryptands do, with a high affinity for ions of a certain charge and radius. Defects in the ion pumps or their control mechanisms can result in major health problems. For example, cystic fibrosis, the most common inherited disease in the United States, is caused by a defect in the transport system (in this case, chloride ions). Similarly, in many cases, hypertension, or high blood pressure, is thought to be due to defective Na+ uptake and/or excretion. If too much Na+ is absorbed from the diet (or if too little is excreted), water diffuses from tissues into the blood to dilute the solution, thereby decreasing the osmotic pressure in the circulatory system. The increased volume increases the blood pressure, and ruptured arteries called aneurysms can result, often in the brain. Because high blood pressure causes other medical problems as well, it is one of the most important biomedical disorders in modern society. For patients who suffer from hypertension, low-sodium diets that use NaCl substitutes, such as KCl, are often prescribed. Although KCl and NaCl give similar flavors to foods, the K + is not readily taken up by the highly specific Na+-uptake system. This approach to controlling hypertension is controversial, however,. Choices: - cells - minerals - acids - proteins A:
A: proteins