(Q).
Answer the following question given this paragraph: Veins are blood vessels that carry blood toward the heart. This blood is no longer under pressure, so veins have thinner walls. To keep the blood moving, many veins have valves that prevent the backflow of blood. Veins generally carry oxygen-poor blood. The smallest veins are called venules. They merge to form larger and larger veins. The largest vein is the inferior vena cava, which carries blood from the lower body directly to the heart. Q: What are the blood vessels that carry blood toward the heart and tend to have thinner walls? Choices: - capillaries - glands - clots - veins A:
(A).
veins

(Q).
Answer the following question given this paragraph: Lipids consist only or mainly of carbon, hydrogen, and oxygen. Both fats and oils are made up of long chains of carbon atoms that are bonded together. These chains are called fatty acids. Fatty acids may be saturated or unsaturated. In the Figure below you can see structural formulas for two small fatty acids, one saturated and one unsaturated. Q: Both fats and oils are made up of long chains of carbon atoms that are bonded together. what are these chains called? Choices: - amino acids - metabolic acids - nucleic acids - fatty acids A:
(A).
fatty acids

(Q).
Answer the following question given this paragraph: Pressure is what results when gas particles rebound off the walls of their container. The basic unit of pressure is the newton per square meter (N/m2). This combined unit is redefined as a pascal (Pa). One pascal is not a very large amount of pressure. A more useful unit of pressure is the bar, which is 100,000 Pa (1 bar = 100,000 Pa). Other common units of pressure are the atmosphere (atm), which was originally defined as the average pressure of Earth's atmosphere at sea level; and mmHg (millimeters of mercury), which is the pressure generated by a column of mercury 1 mm high. The unit millimeters of mercury is also called a torr, named after the Italian scientist Evangelista Torricelli, who invented the barometer in the mid1600s. A more precise definition of atmosphere, in terms of torr, is that there are exactly 760 torr in 1 atm. A bar equals 1.01325 atm. Given all the relationships between these pressure units, the ability to convert from one pressure unit to another is a useful skill. Q: What results when gas particles rebound off the walls of their container? Choices: - light - pull - weight - pressure A:
(A).
pressure