How to Solve ACT Science – Conflicting Viewpoints (Comparing Hypotheses, Scientist Arguments)

How to Solve ACT Science – Conflicting Viewpoints (Comparing Hypotheses, Scientist Arguments)

Introduction

"Mastering Conflicting Viewpoints on the ACT Science section can boost your score by 2–4 points—enough to turn a ‘good’ ACT into a ‘scholarship-worthy’ one. This is the passage type where two (or more) scientists argue about the same data, and your job is to compare their claims, not just memorize facts. Let’s break it down so you can crush it on test day."

WHAT YOU NEED TO KNOW FIRST

Before diving in, make sure you understand: 1. Basic ACT Science Passage Structure – You’ll see 6–7 passages, and 1 is always Conflicting Viewpoints. 2. How to Read Graphs/Tables Quickly – Even if the passage is text-heavy, data is often referenced. 3. Difference Between Hypothesis, Theory, and Evidence – A hypothesis is a proposed explanation; evidence supports or refutes it.

KEY TERMS & FORMULAS

(No formulas here—this is a reading comprehension task! But know these terms cold.)

MEMORIZE THIS: - Scientist 1 vs. Scientist 2 – Always ask: What do they agree on? Where do they disagree? - Evidence > Opinion – The ACT rewards students who tie claims back to data, not just restate them.

STEP-BY-STEP METHOD

(Follow these steps for EVERY Conflicting Viewpoints passage.)

Step 1: Skim the Introduction (10–15 sec)

• Read the first 2–3 sentences to understand the topic (e.g., "Two scientists debate how dinosaurs went extinct").
• Identify what’s being studied (e.g., asteroid impact vs. volcanic activity).
• Do NOT read the whole intro—just get the big picture.

Step 2: Read the Viewpoints (30–45 sec total)

• Read Scientist 1’s argument first. Underline:
• Their main claim (1 sentence).
• Key evidence (data, experiments, or observations they cite).
• Assumptions (what they take for granted).
• Repeat for Scientist 2 (or 3).
• Compare as you go: Circle where they agree and where they disagree.

Step 3: Preview the Questions (10 sec)

• Glance at the first 1–2 questions to see if they ask about:
• Similarities ("Which statement do both scientists support?")
• Differences ("How does Scientist 1’s explanation differ from Scientist 2’s?")
• Evidence ("Which data would weaken Scientist 2’s argument?")

Step 4: Answer the Questions (Use the "3-Pass System")

Pass 1: Direct Comparison Questions - These ask about agreements/disagreements. - Strategy: Go back to your underlined notes and match claims. -
Example: "Both scientists would agree that…" → Find the circled overlap.

Pass 2: Evidence-Based Questions - These ask which data supports/weakens a claim. - Strategy: Look for numbers, graphs, or experiments mentioned in the passage. -
Example: "Which finding would support Scientist 1’s hypothesis?" → Find data tied to their claim.

Pass 3: Inference Questions - These ask you to predict or interpret based on the arguments. - Strategy: Ask: "If this scientist is right, what else must be true?" -
Example: "If Scientist 2’s theory is correct, what would future research likely find?"

Step 5: Double-Check for Traps

• Trap 1: Questions that ask about one scientist’s view but use wording from the other.
• How to spot: If the question says "According to Scientist 1…" but the answer choice matches Scientist 2, it’s wrong.
• Trap 2: "Most likely" or "could" questions—these test implications, not direct claims.
• How to avoid: Stick to what’s explicitly stated or logically follows from the passage.
• Trap 3: Graphs/tables that seem unrelated—always check if they’re referenced in the arguments.
• How to avoid: If a scientist mentions "temperature data," look at the graph labeled "Temperature."

WORKED EXAMPLES

Example 1 – Basic

Passage (Simplified): Two scientists debate why a certain plant species is dying in a forest. - Scientist 1: The plants are dying because of increased soil acidity from nearby factory pollution. Studies show soil pH dropped from 6.5 to 4.2 in 5 years. - Scientist 2: The plants are dying because of a new insect pest that eats their leaves. Lab tests show plants with insect damage die 3x faster.

Question: Which statement would both scientists likely agree with? A) The factory is causing the plant deaths. B) Insects are the primary cause of plant deaths. C) The plants are dying. D) Soil acidity has not changed.

Step-by-Step Solution: 1. Scientist 1’s claim: Soil acidity is killing plants. 2. Scientist 2’s claim: Insects are killing plants. 3. Where do they agree? Both say the plants are dying (just disagree on why). 4. Eliminate wrong answers:
- A) Only Scientist 1 believes this.
- B) Only Scientist 2 believes this.
- D) Scientist 1 says acidity has changed. 5. Correct answer: C) The plants are dying.

What we did and why: We compared the two arguments and found the only point they both accept—that the plants are dying. The ACT often tests shared ground before differences.

Example 2 – Medium

Passage (Simplified): Two scientists debate how a new drug works. - Scientist A: The drug blocks a specific protein (Protein X), which reduces inflammation. In trials, patients with high Protein X levels improved the most. - Scientist B: The drug boosts immune cell activity, which fights inflammation. In trials, patients with strong immune responses improved the most.

Question: Which finding would weaken Scientist A’s argument? A) Patients with low Protein X levels still improved. B) The drug does not affect immune cells. C) Protein X levels were the same in all patients. D) The drug reduces inflammation in lab tests.

Step-by-Step Solution: 1. Scientist A’s claim: Drug works by blocking Protein X. 2. Key evidence: Patients with high Protein X improved most. 3. What weakens this? If low Protein X patients also improved, the drug might work another way. 4. Check answer choices:
- A) This weakens Scientist A—if low Protein X patients improved, blocking Protein X isn’t the only factor.
- B) This supports Scientist A (if immune cells aren’t involved, Protein X is more likely the cause).
- C) This doesn’t weaken—if levels were the same, blocking Protein X could still matter.
- D) This supports both scientists (just confirms the drug works). 5. Correct answer: A) Patients with low Protein X levels still improved.

What we did and why: We identified the core of Scientist A’s argument (Protein X blocking) and found data that contradicts it. The ACT loves testing what would disprove a claim.

Example 3 – Exam-Style

Passage (ACT-Style): Two astronomers debate the origin of a newly discovered planet. - Astronomer 1: The planet formed near its star and migrated outward. Evidence: The planet’s orbit is circular, and inner planets in the system are rocky. - Astronomer 2: The planet formed far from its star and was pulled inward. Evidence: The planet has a high concentration of ice, which only forms in cold, outer regions.

Question: Which observation would most support Astronomer 2’s hypothesis? A) The planet’s orbit is highly elliptical. B) The planet has a thick hydrogen atmosphere. C) The star’s other planets are all gas giants. D) The planet’s core is made of heavy metals.

Step-by-Step Solution: 1. Astronomer 2’s claim: Planet formed far from the star (where ice forms). 2. Key evidence: Planet has high ice concentration. 3. What would support this? More evidence that the planet came from a cold region. 4. Check answer choices:
- A) Elliptical orbit suggests gravitational disruption (could mean it was pulled inward—supports Astronomer 2).
- B) Hydrogen atmosphere is common in gas giants—doesn’t prove outer formation.
- C) Other gas giants don’t tell us about this planet’s origin.
- D) Heavy metals could form anywhere—not specific to outer regions. 5. Correct answer: A) The planet’s orbit is highly elliptical.

What we did and why: We linked the question to Astronomer 2’s key evidence (ice = cold region) and found the answer that best fits their logic. The ACT often disguises support questions with technical details—focus on what the scientist cares about.

COMMON MISTAKES

EXAM TRAPS

1-MINUTE RECAP

"Alright, listen up—this is your 60-second crash course for Conflicting Viewpoints on the ACT Science section. First, skim the intro to get the topic. Then, read each scientist’s argument and underline their main claim, evidence, and assumptions. Circle where they agree and where they disagree. When answering questions, use the 3-pass system: 1) Direct comparisons, 2) Evidence-based, 3) Inferences. Watch out for traps—don’t mix up the scientists, and only use data they actually mention. If a question asks what weakens a claim, find the answer that contradicts their evidence. If it asks what they’d agree on, look for the overlap. You’ve got this—go in confident, and don’t overthink it!