Correct Answer: D

Rationale: The correct answer is D: 'On the side.' Lateral means situated on the side or away from the midline. Choices A, B, and C are incorrect because lateral specifically refers to a position that is situated away from the midline, not near it, at the top of the body, or on the side.

Correct Answer: B

Rationale: The correct answer is B, 'Made worse.' When a symptom is exacerbated, it means that it is becoming more severe or intense. Choices A, C, and D are incorrect. A is the opposite of exacerbated as improving means getting better, C means remaining unchanged, and D means to make something better or improve, which is the opposite of exacerbate.

Correct Answer: B

Rationale: Diffusion is the process where substances move from an area of high concentration to an area of low concentration. This movement occurs due to the random motion of particles and continues until equilibrium is reached. Choice A is incorrect because diffusion occurs down the concentration gradient, from high to low concentration, not from low to high concentration. Choice C is incorrect as it refers to the uptake of substances by cells, not the general process of diffusion. Choice D is incorrect as it does not accurately describe the process of diffusion; diffusion involves the movement of substances, not the breaking of materials.

Correct Answer: C

Rationale: The term 'etiology' refers to the cause or origins of a disease. In this context, the question is asking for the underlying reason or cause of the flu epidemic of 1918. Therefore, the correct answer is C. 'Etiology.' Choice A, 'Pathology,' is incorrect as it refers to the study of diseases rather than the cause itself. Choice B, 'Transmission,' is incorrect as it relates to how a disease spreads rather than its cause. Choice D, 'Mortality rate,' is incorrect as it refers to the number of deaths caused by a disease rather than the cause of the disease itself.

Correct Answer: B

Rationale: The correct answer is 'Withered.' Atrophied means that a body part has wasted away or decreased in size. 'Enlarged' (Choice A) means to make or become larger, which is the opposite of atrophied. 'Swollen' (Choice C) means to become larger or rounder in size, usually due to fluid retention or inflammation, which is not the same as atrophied. 'Damaged' (Choice D) means harmed or injured, but it does not specifically refer to the wasting away or shrinking of a body part.