Conflicting Viewpoints

Conflicting Viewpoints questions on the ACT Science section present two or more scientists, students, or researchers who offer different explanations for the same phenomenon. Your job is to understand each viewpoint, identify where they agree and disagree, and evaluate how specific evidence relates to each position.

Understanding Each Viewpoint

Before comparing viewpoints, make sure you understand each one on its own. Identify the central claim, the reasoning behind it, and any evidence cited. Each viewpoint will have a distinct explanation for the observed phenomenon — do not blend them together. Keep them mentally separate, as if each scientist is making a case in front of you.

Active reading strategy: As you read each viewpoint, write a brief mental summary:

• Scientist 1: Claims [X] because [evidence Y]
• Scientist 2: Claims [A] because [evidence B]

Identifying Points of Agreement and Disagreement

Even scientists who disagree about an explanation often agree on the underlying facts. Questions often test whether you can distinguish shared observations from competing interpretations.

• Common ground: What facts do all viewpoints accept as true?
• Point of divergence: Where exactly do the explanations differ?
• Subtle differences: Sometimes viewpoints agree on the mechanism but disagree on the degree or timing.

Example:
Two scientists both agree that a patient's symptoms include fatigue and joint pain. Scientist 1 attributes these to an autoimmune disorder. Scientist 2 attributes them to a nutritional deficiency. The facts are shared; the interpretations differ.

Argument Analysis

Each viewpoint in a Conflicting Viewpoints passage is essentially an argument: a claim supported by reasoning and evidence. To analyze arguments effectively:

• Identify the claim: What is the scientist saying is true? State it in one sentence.
• Identify the evidence: What observations, data, or facts does the scientist cite to support the claim?
• Identify the reasoning: How does the scientist connect the evidence to the claim? Is the logic sound?
• Check for assumptions: What is the scientist taking for granted that might not be proven?
• Look for gaps: Is there evidence the scientist ignores or fails to address?

Worked Example: Three-Viewpoint Passage

Observation: A lake's fish population has declined by 60% over 10 years.

Scientist 1: The decline is caused by increased water temperature due to climate change. Warmer water holds less dissolved oxygen, stressing cold-water fish species. Data shows the lake's average temperature has risen 2.5°C over the same period.

Scientist 2: The decline is caused by an invasive predator species (pike) introduced 12 years ago. Pike prey on native fish. Stomach analyses of pike show native fish as their primary food source.

Scientist 3: The decline is caused by agricultural runoff increasing nutrient levels, triggering algal blooms that deplete oxygen. Phosphate levels in the lake have tripled in the last decade.

Question: "Which scientists would agree that oxygen levels play a role in the fish decline?"
Answer: Scientists 1 and 3. Scientist 1 says warmer water holds less oxygen; Scientist 3 says algal blooms deplete oxygen. Both cite oxygen as a factor, though they disagree on the cause of oxygen loss. Scientist 2's explanation involves predation, not oxygen.

Question: "If oxygen levels in the lake were measured and found to be normal, which viewpoint(s) would be weakened?"
Answer: Both Scientist 1 and Scientist 3 would be weakened, since both rely on reduced oxygen as the mechanism. Scientist 2's predation theory would remain unaffected.

Evaluating Evidence

A key question type asks which piece of evidence would strengthen or weaken a particular viewpoint. To answer these, you need to understand what each viewpoint predicts.
Think about each viewpoint's predictions: what would you expect to observe if this viewpoint were correct? What observations would be inconsistent with it?

Worked Example: Evidence Testing

Scientist 1 claims that a planet's red color is caused by iron oxide (rust) in its soil. Scientist 2 claims the red color comes from atmospheric particles scattering light.

Question: "A probe lands on the planet and analyzes the soil, finding it contains 40% iron oxide by weight. How does this affect each viewpoint?"

Step 1: This directly supports Scientist 1 — iron oxide in the soil is exactly what their theory predicts.
Step 2: This does NOT necessarily weaken Scientist 2. The soil could contain iron oxide AND the atmosphere could scatter light. However, Scientist 1's theory is now strongly supported by direct evidence, making it more compelling.
Key insight: Evidence that supports one viewpoint does not always weaken the other — both explanations could be partially correct.

Evaluating Internal Consistency

Some questions ask whether a viewpoint is internally consistent — does the evidence cited by a scientist actually support the conclusion drawn?

• A scientist might present valid data but draw an unsupported conclusion from it.
• Read critically: does the reasoning follow logically from the evidence, or are there gaps?
• Check if the conclusion is too broad for the evidence provided. A study on mice does not necessarily prove the same effect in humans.

Common Mistakes

Common Question Patterns

• "Both scientists would agree that..." — Look for shared facts or observations, not interpretations.
• "Which finding would support Scientist 1?" — Identify what Scientist 1 predicts, then find matching evidence.
• "Scientist 2 would most likely respond by saying..." — Use Scientist 2's reasoning to predict their reaction.
• "A weakness in Scientist 1's argument is..." — Look for assumptions, missing evidence, or logical gaps.
• "If [new information], which viewpoint is supported?" — Test the new info against each viewpoint's predictions.

Practice Walkthrough

Passage: Two students disagree about why a metal spoon feels colder than a wooden spoon at room temperature, even though both are the same temperature.

Student 1: The metal spoon IS colder. Metals absorb cold from the environment more efficiently, so the metal spoon's actual temperature is lower than the wooden spoon's.

Student 2: Both spoons are at room temperature (22°C). Metal feels colder because it conducts heat away from your hand faster than wood does. Your hand loses heat quickly to the metal, which your brain interprets as "cold."

Question: If both spoons were measured with a thermometer and found to be exactly 22°C, which viewpoint is supported?

Solution:
Step 1: Student 1 claims the metal spoon is actually at a lower temperature. A thermometer reading of 22°C for both spoons directly contradicts this claim.
Step 2: Student 2 claims both spoons are the same temperature and the difference is in heat conduction rate. A reading of 22°C for both supports this claim perfectly.
Answer: Student 2 is supported; Student 1 is weakened.

Quick Reference: Conflicting Viewpoints Approach

ACT-Specific Hacks

• Label viewpoints clearly: "Scientist 1 says X because Y" and "Scientist 2 says A because B."
• Stay neutral: Do not assume one viewpoint is correct — the test asks you to understand all of them, not pick a winner.
• Predictions matter: For "which evidence supports/weakens" questions, think about what each viewpoint would PREDICT.
• Agreement questions: Look for facts or observations that all scientists accept, even if they interpret them differently.
• Attribution: Make sure you attribute the right claim to the right scientist. This is a common source of wrong answers.
• Budget extra time: These passages are longer than other Science passages. Plan for about 8 minutes per Conflicting Viewpoints passage.
• Read all viewpoints before answering: You need the full picture to answer comparison and evidence questions correctly.
• The "both would agree" shortcut: These questions are asking about observable FACTS, not explanations. If an answer choice contains an explanation or interpretation, it is almost certainly wrong.
• Eliminate by viewpoint: For "which supports Scientist 1" questions, first identify what Scientist 1 NEEDS to be true. Then find the answer that matches. Wrong answers often support a different scientist.
• Do this passage LAST: Conflicting Viewpoints is the most reading-heavy passage type. Save it for last so you can bank time from faster Data Representation passages.