Science as a human endeavour

Year 8 answers

Fluency

Scientific knowledge changes when new evidence appears, better instruments allow new observations, or improved ideas explain data better. Theories are revised or replaced as understanding grows.
Any valid example, e.g. continental drift $\to$ plate tectonics; geocentric $\to$ heliocentric model; phlogiston $\to$ oxygen theory of combustion; stress $\to$ bacterial cause of ulcers.
Research that draws on several different fields of expertise to answer a question no single field could answer alone.
Any three of: physics, chemistry, biology, geology, mathematics/statistics, computer science.
Cultural burning / fire management practices are now used alongside modern bushfire science to reduce fuel loads and protect biodiversity.

Fluency

An issue where science informs a decision but other factors (ethical, economic, social, environmental) also matter. Examples: climate policy, vaccine mandates, GM crops, nuclear power.
Example (nuclear power): ethical — waste for future generations; environmental — low CO $_2$ but radioactive waste; social — public trust, local community impact; economic — high up-front cost but low fuel cost.
Different groups weigh risks, costs, and ethical values differently; they may also have different access to information or different things to lose. The science can be the same but the decision still varies.
Any valid example, e.g. banning leaded petrol (after research showed lead harm), restricting CFCs (after ozone-layer research), tobacco regulation, asbestos bans.

Reasoning

Any three of: How many dentists were surveyed? Were they paid or sponsored by the company? What exactly did they recommend — this brand, or “any fluoride toothpaste”? Was the claim peer-reviewed? Is the study repeatable?
Advantage: reaches large audiences quickly; lets scientists communicate directly. Risk: misinformation spreads as fast as accurate information; algorithms favour emotional content over evidence.
Honestly: acknowledges that measurements and models always have uncertainty, and new evidence can refine conclusions. Dishonestly: used to pretend weak evidence exists on both sides to delay action (e.g. tobacco, climate change).
In favour (science): at low concentrations fluoride reduces tooth decay across a population. Against (ethics): mass medication removes individual consent — people cannot easily opt out of the water supply.

Problem solving

Virologists/microbiologists, immunologists, chemists (formulating the vaccine), statisticians (trial design), medical doctors (clinical trials), manufacturing engineers, public health officials, ethicists. Any four.
Benefit: cheap large-scale electricity, local employment. Cost: CO $_2$ and particulate emissions, mining impacts. Third factor: social/ethical — climate impact on future generations, or job security for the workforce if the plant is closed.
Individual: only use antibiotics as prescribed; finish the course; avoid demanding antibiotics for viral illnesses. Policy: restrict routine antibiotic use in livestock; fund new antibiotic development; national surveillance of resistant strains.
The noble gases slotted neatly into a new column (Group 18) that had not been known before, without requiring changes elsewhere. A good classification should be able to absorb new data — the fact that it did was evidence the table reflected a real underlying pattern.

Reasoning

Marshall and Warren were initially dismissed because their claim contradicted the consensus. But they gathered strong evidence (including Marshall deliberately infecting himself) and eventually won the argument on evidence alone. Science needs room for challenging the majority view — provided the evidence is tested rigorously. Consensus should not be protected from new data.
Both tobacco and climate-change responses show a pattern: industries funded research designed to emphasise uncertainty, attacked inconvenient studies, and lobbied policy-makers to delay regulation. In both cases, the overwhelming scientific evidence eventually led to public-health and environmental policy, but decades of delay caused real harm.
Science is decided by the weight of evidence, not public opinion. The theory of evolution is supported by genetics, fossils, comparative anatomy, and direct observation of evolution in microbes. Polling shows cultural beliefs, not scientific soundness. Scientists should communicate better, but not adjust their confidence to public mood.
Answers will vary; a complete answer should (a) summarise the key evidence, (b) describe at least two competing stakeholders (e.g. fossil-fuel industry vs climate-impacted communities), (c) take a clear position with reasons, and (d) specify the evidence that would change the writer’s mind — the last point is the most important test of scientific thinking.