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Lymph nodes are small, bean-shaped organs located along lymphatic vessels that filter lymph before it returns to the venous circulation. They contain B-cell follicles (with germinal centers) and T-cell–rich paracortex, plus macrophages in the sinuses that trap and present antigens. During infection, nodes often enlarge (reactive lymphadenopathy) as lymphocytes proliferate—hallmark evidence of local immune activation. The spleen (A) filters blood (not lymph), removing old erythrocytes and mounting responses to blood-borne antigens; it features white and red pulp. The thymus (C) is the site of T-cell maturation (positive/negative selection) in childhood and involutes with age; it does not filter lymph. Tonsils (D) are lymphoid tissues in the oropharynx that sample antigens entering via the mouth/nose; while they can hypertrophy or become infected, the specific organ that filters lymph throughout the body and commonly becomes tender during regional infections is the lymph node. TEAS A&P often asks you to map structure to function across the lymphatic/immune system: nodes (filter lymph), spleen (filter blood), thymus (T-cell education), bone marrow (B-cell maturation), and MALT (mucosal defense). Knowing these roles helps interpret clinical findings such as localized vs generalized lymphadenopathy and guides routes of metastasis tracking.

Principal (with “pal”) functions as an adjective meaning main or most important; principle is a noun meaning a fundamental rule or belief. In the sentence, the word modifies “goal,” indicating primacy; therefore principal is correct (B). Options A, C, D misuse or inflect the wrong word: principle would fit in sentences like “We followed the principle of beneficence,” not when describing the main goal. The possessive forms (C, D) are ungrammatical in this context. TEAS frequently tests near-homophones with distinct parts of speech and meanings (e.g., compliment/complement, affect/effect, stationary/stationery). When in doubt, substitute a synonym: if “main” or “primary” fits, choose principal; if “rule” or “tenet” fits, choose principle. Keeping a brief mental definition beside each option helps avoid last-minute switches caused by familiarity rather than function.

On TEAS Reading, identifying the main idea requires distinguishing the overall point from supporting details. The passage centers on protective actions during lightning: seeking proper shelter, avoiding tall isolated trees, and using the “30–30” waiting rule. These specifics function as supporting details that serve a broader purpose—communicating safety guidance to reduce lightning risk. Option B captures that general purpose succinctly. Option A (“fascinating weather phenomenon”) misreads tone; the text is prescriptive, not descriptive or entertaining. Option C isolates one detail (trees) and inflates it to the main idea, a common distractor pattern on TEAS: a strong detail is offered as if it were the central message. Option D is factually incorrect; the passage even notes lightning can strike “miles from rainfall,” directly contradicting the claim that storms “always occur with heavy rain.” For TEAS success, summarize the text in a single sentence in your own words; if your summary resembles a choice, that choice usually reflects the main idea.

Interpret multiple constraints. Walk-ins are allowed only on weekdays between 10:00 a.m.–12:00 p.m. Choice C fits both: Wednesday is a weekday, and 11:50 a.m. is within the walk-in window. Choice A fails twice: 5:45 p.m. is outside the walk-in window, and it also violates the last check-in rule (6:00 p.m. close ⇒ last check-in 5:30 p.m.). Choice B concerns a scheduled patient on Saturday; Saturday closes at 1:00 p.m., so last check-in is 12:30 p.m.—12:40 p.m. is too late. Choice D is a scheduled patient on Friday at 5:40 p.m.; because last check-in is 5:30 p.m., this is also too late. TEAS Reading often embeds overlapping conditions (time windows, exceptions); underline each constraint and test the scenario against all rules. Convert “last check-in 30 minutes before closing” to specific times to avoid misreading: Weekdays last check-in 5:30 p.m.; Saturday last check-in 12:30 p.m. Apply the strictest applicable rule to the scenario.

TEAS Reading often pairs text interpretation with numeracy. “Per serving” means each 1-cup portion delivers 180 calories and 12 g added sugars. With 2 servings per container, eating the entire container doubles both values: (180 \times 2 = 360) calories and (12 \times 2 = 24) g added sugars. Thus B is supported. A ignores the serving count. C invents a calorie number inconsistent with the per-serving listing and keeps sugars at a single-serving value. D inconsistently doubles calories but not sugars, contradicting the equal scaling implied by “per serving.” Strategy: when labels provide both per-serving values and servings per container, compute per-container totals by multiplying. Watch for distractors that multiply one nutrient but not others, or that assume “per container” without verifying the serving count. As an exam habit, underline units (“per serving,” “per container”) and be wary of vague front-label claims; the Nutrition Facts panel provides the authoritative quantitative information to support inferences about total intake.