Answer the following question given this paragraph: Convection is the transfer of heat by a current. Convection happens in a liquid or a gas. Air near the ground is warmed by heat radiating from Earth's surface. The warm air is less dense, so it rises. As it rises, it cools. The cool air is dense, so it sinks to the surface. This creates a convection current, like the one in Figure below . Convection is the most important way that heat travels in the atmosphere. Q: What is the transfer of heat by a current? Choices: - radiation - combustion - diffusion - convection A:
convection
(Question)
Answer the following question given this paragraph: Heart: Coronary Artery Disease Coronary artery disease is the leading cause of death worldwide. It occurs when the buildup of plaquea fatty material including cholesterol, connective tissue, white blood cells, and some smooth muscle cellswithin the walls of the arteries obstructs the flow of blood and decreases the flexibility or compliance of the vessels. This condition is called atherosclerosis, a hardening of the arteries that involves the accumulation of plaque. As the coronary blood vessels become occluded, the flow of blood to the tissues will be restricted, a condition called ischemia that causes the cells to receive insufficient amounts of oxygen, called hypoxia. Figure 19.16 shows the blockage of coronary arteries highlighted by the injection of dye. Some individuals with coronary artery disease report pain radiating from the chest called angina pectoris, but others remain asymptomatic. If untreated, coronary artery disease can lead to MI or a heart attack. Q: What is the leading cause of death worldwide? Choices: - lung disease - cancer - liver failure - coronary artery disease A:
(Answer)
coronary artery disease
Ques: Answer the following question given this paragraph: Many kinds of waves exist, such as sound waves and water waves. Visible light is also a wave. It is a specific type of a more general phenomenon called an electromagnetic wave. All waves can be described in terms of the basic physical properties frequency and wavelength . These two properties are related to the speed of a wave by the following equation:. Q: What type of wave is visible light? Choices: - static - radio - acoustic - electromagnetic A:
Ans: electromagnetic
(Q).
Answer the following question given this paragraph: Once again, a mutation is the change in the DNA or RNA sequence. In multicellular organisms, mutations can be subdivided into germline mutations and somatic mutations. Germline mutations occur in the DNA of sex cells, or gametes, and are therefore potentially very serious. These mutations can be passed to the next generation. If the zygote contains the mutation, every cell in the resulting organism will have that mutation. If the mutation results in a disease phenotype, the mutation causes what is called a hereditary disease. Somatic mutations , which occur in somatic, or body, cells, cannot be passed to the next generation (offspring). Mutations present in a somatic cell of an organism will be present (by DNA replication and mitosis) in all descendants of that cell. If the mutation is present in a gene that is not used in that cell type, the mutation may have no effect. On the other hand, the mutation may lead to a serious medical condition such as cancer. Q: In multicellular organisms, mutations can be subdivided into germline mutations and? Choices: - elective mutations - comparative mutations - resultant mutations - somatic mutations A:
(A).
somatic mutations
Ques:Answer the following question given this paragraph: Smog clouds the city of Los Angeles, California. Visible air pollution in the form of smog is a sign that the air is unhealthy. Q: Smog is a visible form of what? Choices: - condensation - water pollution - oxidation - air pollution A:

Ans:air pollution
Ques: Answer the following question given this paragraph: Blood pressure is read as two numbers. The first number is the systolic pressure. The systolic pressure is the pressure on the blood vessels when the heart beats. This is the time when there is the highest pressure in the arteries. The diastolic pressure, which is the second number, is when your blood pressure is lowest, when the heart is resting between beats. Q: What does the second number in a blood pressure reading measure? Choices: - external pressure - optimal pressure - epithelial pressure - diastolic pressure A:
Ans:
diastolic pressure