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# Why sort living things?

Year 7 Biology · Classification

<!-- Speaker note: Students explain why living things are classified (identifying, communicating, showing relationships), tell classification from a plain list, and give an everyday example (AC9S7U01, node 1). About 14 minutes (Engage and Explore 5 min · Explain 6 min · Evaluate 2 min · Typical adds 3 min, Wider about 3 min). -->

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## Today

**We are learning to** scientists classify living things to identify them, to talk about them clearly (one name the whole world understands), and to see how they are related. A classification is built for a purpose, and different systems can suit different purposes.

- I can give two reasons why living things are classified.
- I can tell classification from a simple list.
- I can give an everyday example of classification.

<!-- Speaker note: Before class: A short concept tutorial to open the unit, before Plant, animal or something else? (kingdoms, node 2) and Who is it? Using a key (node 3). Set the width with `?width=minimum`, `typical` (default) or `wider`. Not a hinge node, and mostly a discussion: the board is a five-animal key to show identification in action. The progression's Wider lenses (First Nations classification, change through microscopy, biosecurity) are richer in class than on screen. Board notes: the key uses features you can see; students meet longer keys in node 3. Teacher: In your own words: two reasons and an everyday example. -->

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## Why it matters

> There are about 2 million named species of living things, and millions more not yet named. Without a system, how would anyone find their way around them?

<!-- Speaker note: A short lesson: why we classify at all, before the kingdoms and keys. -->

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## Engage: predict

**A scientist finds a beetle she has never seen. Why does it help that beetles are already classified and named?**

- It doesn't help: classification is just a tidy list
- She can work out what it is, or show it is new, and tell other scientists exactly which beetle she means
- So the beetle can be put in a museum
- So she knows how many legs it has

<!-- Speaker note: What happens: Classification lets her identify it (or show it is a new species), and its name lets scientists everywhere know exactly which beetle she means. Its group also tells her what it is related to. Take two or three predictions before anyone runs it. -->

<!-- Speaker note: Teacher: ask students who chose 'a tidy list' what the list would let them do. -->

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## Explore it

{{embed: https://studio.learningwaypoints.com/tutorials/_playground-board/index.html?id=deck%2Fscience%2Fbiology-7%2Fwhy-classify%2Fstep-2&code=widget%3A+key%0Astep+A%3A+Does+it+have+a+backbone%3F+%7C+B+%7C+D%0Astep+B%3A+Does+it+have+feathers%3F+%7C+Kookaburra+%7C+C%0Astep+C%3A+Does+it+lay+eggs%3F+%7C+Platypus+%7C+Red+kangaroo%0Astep+D%3A+Does+it+have+six+legs%3F+%7C+Bull+ant+%7C+Huntsman+spider%0Aspecimen%3A+Red+kangaroo+%7C+A+backbone%2C+fur%2C+and+its+young+grow+in+a+pouch.%0Aspecimen%3A+Bull+ant+%7C+No+backbone%3B+a+hard+outer+skeleton+and+six+legs.%0Aspecimen%3A+Platypus+%7C+A+backbone%2C+fur+and+a+flat+bill%3B+lays+eggs.%0Aspecimen%3A+Kookaburra+%7C+A+backbone%2C+feathers+and+a+strong+beak%3B+lays+eggs.%0Aspecimen%3A+Huntsman+spider+%7C+No+backbone%3B+eight+legs+and+two+body+parts.%0Aneed%3A+2%0A&fresh=1}}

[Open this step in the tutorial](https://studio.learningwaypoints.com/tutorials/science/biology-7/why-classify/?full=step-2#step-2)

<!-- Speaker note: Answer each question about the animal shown. The key is built from groups: backbone or not, then feathers or not. -->

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<span style="background:#dcfce7; color:#1a1a1a; border:1.5px solid #22c55e; padding:6px 18px; border-radius:8px; font-size:1em; font-weight:500;">✅ Check</span>

## What happened?

* Classification lets her identify it (or show it is a new species), and its name lets scientists everywhere know exactly which beetle she means. Its group also tells her what it is related to.

<!-- Speaker note: Reveal after running. Ask who predicted it, and what made them think so. -->

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<span style="background:#dcfce7; color:#1a1a1a; border:1.5px solid #22c55e; padding:6px 18px; border-radius:8px; font-size:1em; font-weight:500;">✅ Check</span>

## Reasons

**Is it a reason scientists classify living things?**

Groups: A reason to classify · Not a reason

To identify an organism they don't know · To use names every scientist understands · To see which organisms are related · To make the living world look neat · To decide which organisms are better

* Answer: To identify an organism they don't know → A reason to classify; To use names every scientist understands → A reason to classify; To see which organisms are related → A reason to classify; To make the living world look neat → Not a reason; To decide which organisms are better → Not a reason

<!-- Speaker note:  -->

<!-- Speaker note: Teacher: the reasons sort and the 'classification or a list' question are the success criteria. -->

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<span style="background:#dcfce7; color:#1a1a1a; border:1.5px solid #22c55e; padding:6px 18px; border-radius:8px; font-size:1em; font-weight:500;">✅ Check</span>

## Classification or a list

**Which is classification, not just a list?**

- Writing animals in alphabetical order
- Grouping animals by shared features, such as backbone or no backbone, then smaller groups inside
- Numbering animals in the order you saw them

* Answer: Grouping animals by shared features, such as backbone or no backbone, then smaller groups inside

<!-- Speaker note: Classification groups things by what they share, so the group tells you something about each member. -->

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<span style="background:#dcfce7; color:#1a1a1a; border:1.5px solid #22c55e; padding:6px 18px; border-radius:8px; font-size:1em; font-weight:500;">✅ Check</span>

## Everyday classification

**A supermarket groups food by aisle: dairy, bakery, fruit. How is that like scientific classification?**

- Groups by shared features help people find things and talk about them
- It isn't: only scientists classify
- Both put things in alphabetical order

* Answer: Groups by shared features help people find things and talk about them

<!-- Speaker note: Libraries, supermarkets and phone contacts all classify, for a purpose. Scientific classification's purposes are identifying, communicating and showing relationships. -->

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<span style="background:#fef3c7; color:#1a1a1a; border:1.5px solid #f59e0b; padding:6px 18px; border-radius:8px; font-size:1em; font-weight:500;">✍️ Activity</span>

## Elaborate: two ways to group

{{embed: https://studio.learningwaypoints.com/tutorials/_playground-board/index.html?id=deck%2Fscience%2Fbiology-7%2Fwhy-classify%2Fstep-4&code=widget%3A+key%0Astep+A%3A+Does+it+have+a+backbone%3F+%7C+B+%7C+D%0Astep+B%3A+Does+it+have+feathers%3F+%7C+Kookaburra+%7C+C%0Astep+C%3A+Does+it+lay+eggs%3F+%7C+Platypus+%7C+Red+kangaroo%0Astep+D%3A+Does+it+have+six+legs%3F+%7C+Bull+ant+%7C+Huntsman+spider%0Aspecimen%3A+Red+kangaroo+%7C+A+backbone%2C+fur%2C+and+its+young+grow+in+a+pouch.%0Aspecimen%3A+Bull+ant+%7C+No+backbone%3B+a+hard+outer+skeleton+and+six+legs.%0Aspecimen%3A+Platypus+%7C+A+backbone%2C+fur+and+a+flat+bill%3B+lays+eggs.%0Aspecimen%3A+Kookaburra+%7C+A+backbone%2C+feathers+and+a+strong+beak%3B+lays+eggs.%0Aspecimen%3A+Huntsman+spider+%7C+No+backbone%3B+eight+legs+and+two+body+parts.%0Aneed%3A+2%0A&fresh=1}}

[Open this step in the tutorial](https://studio.learningwaypoints.com/tutorials/science/biology-7/why-classify/?full=step-4#step-4)

<!-- Speaker note: What this step is for: Comparing two systems for one purpose shows a classification is chosen for what it is meant to do. -->

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<span style="background:#dcfce7; color:#1a1a1a; border:1.5px solid #22c55e; padding:6px 18px; border-radius:8px; font-size:1em; font-weight:500;">✅ Check</span>

## Which system

**You could group these animals by where they live (land, water, air) or by body features (backbone, feathers, fur). Which is more useful for showing how they are related?**

- Body features: a platypus and a kangaroo share fur and milk, though one swims
- Both are equally useful for every purpose
- Where they live: animals in the same place are related

* Answer: Body features: a platypus and a kangaroo share fur and milk, though one swims

<!-- Speaker note: Grouping by habitat suits some jobs (planning a reserve); grouping by shared features suits others (showing relationships). The purpose decides the system. -->

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<span style="background:#fef3c7; color:#1a1a1a; border:1.5px solid #f59e0b; padding:6px 18px; border-radius:8px; font-size:1em; font-weight:500;">✍️ Activity</span>

## Elaborate: other ways of knowing

{{embed: https://studio.learningwaypoints.com/tutorials/_playground-board/index.html?id=deck%2Fscience%2Fbiology-7%2Fwhy-classify%2Fstep-5&code=widget%3A+key%0Astep+A%3A+Does+it+have+a+backbone%3F+%7C+B+%7C+D%0Astep+B%3A+Does+it+have+feathers%3F+%7C+Kookaburra+%7C+C%0Astep+C%3A+Does+it+lay+eggs%3F+%7C+Platypus+%7C+Red+kangaroo%0Astep+D%3A+Does+it+have+six+legs%3F+%7C+Bull+ant+%7C+Huntsman+spider%0Aspecimen%3A+Red+kangaroo+%7C+A+backbone%2C+fur%2C+and+its+young+grow+in+a+pouch.%0Aspecimen%3A+Bull+ant+%7C+No+backbone%3B+a+hard+outer+skeleton+and+six+legs.%0Aspecimen%3A+Platypus+%7C+A+backbone%2C+fur+and+a+flat+bill%3B+lays+eggs.%0Aspecimen%3A+Kookaburra+%7C+A+backbone%2C+feathers+and+a+strong+beak%3B+lays+eggs.%0Aspecimen%3A+Huntsman+spider+%7C+No+backbone%3B+eight+legs+and+two+body+parts.%0Aneed%3A+2%0A&fresh=1}}

[Open this step in the tutorial](https://studio.learningwaypoints.com/tutorials/science/biology-7/why-classify/?full=step-5#step-5)

<!-- Speaker note: What this step is for: Different knowledge systems classify for different purposes; comparing them shows classification as purposeful and made by people. -->

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<span style="background:#dcfce7; color:#1a1a1a; border:1.5px solid #22c55e; padding:6px 18px; border-radius:8px; font-size:1em; font-weight:500;">✅ Check</span>

## Different purposes

**Many Aboriginal and Torres Strait Islander peoples group plants and animals in ways tied to Country: by uses, seasons, relationships between species and cultural knowledge. Scientific classification groups by shared features and ancestry. What does comparing them show?**

- Each system is built for its purposes, and each holds knowledge the other may not
- Only one of them can be correct
- Classification systems never change

* Answer: Each system is built for its purposes, and each holds knowledge the other may not

<!-- Speaker note: Every classification reflects the purposes and knowledge of the people who built it. Ecologists increasingly work with First Peoples' knowledge of species and seasons. -->

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## Evaluate: look back

Write one sentence: "At first I thought… Now I think… because…"

**Revision summary**

- Scientists classify living things to **identify** them, to **communicate** clearly (one name everyone understands) and to show how they are **related**.
- Classification groups by shared features; a list (alphabetical, by date) does not.
- Every classification is built for a purpose; different purposes can suit different systems.

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<span style="background:#dcfce7; color:#1a1a1a; border:1.5px solid #22c55e; padding:6px 18px; border-radius:8px; font-size:1em; font-weight:500;">✅ Check</span>

## Exit ticket

**A new beetle is found in a Queensland rainforest. Give two ways classifying it helps scientists.**

* Any two of: others can identify it from its features; one scientific name lets scientists everywhere talk about the same beetle; its group shows which beetles it is related to.

<!-- Speaker note: Students answer on paper or a mini whiteboard before the reveal. Anyone who cannot answer needs the main idea again next lesson. Where this leads: Next: Plant, animal or something else? (kingdoms, node 2), which also shows classification changing with evidence. In class: sort a bag of everyday objects two different ways and discuss which grouping suits which purpose. The Wider question on First Nations classification is general: for richer context, use local resources and community guidance, such as seasonal calendars made with Traditional Owners. -->