This original activity uses one criterion: backbone present or absent. It does not attempt a complete animal taxonomy or identify an unknown specimen from a photograph.
Four original evidence cards
The cards use original wording based on the cited classification facts. They are teaching records, not observations from an actual specimen, X-ray, dissection or learner investigation.
| Animal record / item | Supplied trait | Separate teacher group key |
|---|---|---|
| A01 / Q1: dog | Backbone present | Vertebrate |
| A02 / Q2: bony fish | Backbone present | Vertebrate |
| A03 / Q3: octopus | Backbone absent | Invertebrate |
| A04 / Q4: spider | Backbone absent | Invertebrate |
The teacher key contains two vertebrates and two invertebrates. All four are animals; invertebrate does not mean “not an animal.” Keep the animal ID, trait and group key linked throughout the material.
Smithsonian's vertebrate-zoology description identifies vertebrates as animals with backbones. WHOI's teaching material supports the corresponding examples and the distinction from animals without backbones. This activity uses that bounded trait distinction, not the older PDF's broader taxonomy or evolutionary ordering. Its artwork is not reproduced.
Ask for a choice and a reason
For each card, provide labeled Vertebrate / Invertebrate choices and a blank written response to “Which supplied trait supports your choice?” Keep teacher keys separate from the clean learner copy.
The companion checks the group choice against the supplied key. The teacher reads the learner's written explanation. Do not require a single exact sentence or claim that software understood an open-text reason.
A separate bounded rule question can offer Backbone presence / Water habitat / Has legs. Its teacher key is Backbone presence. Use it to discuss which criterion this activity uses; keep it separate from the four animal-item score rather than adding an unexplained fifth point.
Use the water comparison to test the rule
Compare A02 and A03. Both are aquatic examples, yet their supplied backbone traits differ. An answer based only on water therefore does not explain this grouping.
Original planned feedback for choosing Invertebrate on Q2 is:
“A02 states that a backbone is present. Use that trait to choose its group; water habitat is not the rule here.”
For choosing Vertebrate on Q3:
“A03 states that a backbone is absent. Being in water does not make its backbone trait the same as A02's.”
Give feedback about the chosen criterion, not a diagnosis of why the learner answered that way. A correct click paired with “because it lives in water” still gives the teacher an explanation to examine.
Separate an outer covering from a backbone
A spider's exterior support is not a backbone. For this activity, A04's stated absence is the relevant evidence. Do not treat a hard-looking outside as proof of an internal backbone, or say that all invertebrates lack every form of support.
An original planned hint is “Check the specific trait in A04. An outer covering and a backbone are different structures.” Keep the question tied to the supplied record; no specimen image needs to reveal internal anatomy.
Add an unknown-evidence discussion without guessing
An optional A05 record says only “Backbone evidence unknown.” Its discussion answer is Not enough evidence. It is outside the four scored animal items.
The absence of a visible spine in an ordinary picture would not establish that a backbone is absent. Ask what evidence the record would need, rather than force this unknown case into Invertebrate. An unknown record is a reason to pause classification, not delete the record.
Keep practice states distinct from actual achievement
For the companion’s four-item practice, a blank is unanswered. Permit retry. Give each currently correct, checked group choice at most one point, with a maximum of four; repeated checks must not add points. Changing a choice immediately clears its old feedback and checked-count contribution. Reset clears selections, feedback and the local count.
The two/two group totals describe the teacher key set, not an assumed learner score. If a group view contains no selected records, show an ordinary empty view while retaining the underlying cards. When adapting the companion, recheck its controls, keyboard focus, state messages and narrow-screen layout.
Record actual group choices, written reasons and support used in the required school workflow. Four selections do not establish complete taxonomy knowledge or automatic mastery.
Copy a trait-evidence worksheet brief
Create one complete, self-contained US-English HTML companion for “Animal evidence • backbone field cards”. Return the full HTML document, with inline CSS and any JavaScript needed for the local interactions. Use the original scenario, named records, numbers and expected cases below.
Design the page for this task: use clearly labeled input or source records, a readable result or worked example, and an adjacent explanation of the evidence. Use a restrained visual hierarchy, left-aligned text, readable tables or stacked records, and a responsive layout at 720px and 360px. Provide meaningful labeled controls for Check four group choices; Reset practice; Retry A01; Retry A02; Retry A03; Retry A04; Show A04 hint; Backbone presence; Water habitat; Has legs; Not enough evidence; Call it Invertebrate. Use keyboard-accessible native controls and visible focus. Keep the complete content readable without an external dependency.
The following brief supplies the substantive content and constraints. Native-format requests describe the material to represent or copy manually; this HTML must not pretend to create DOCX, XLSX, PDF, PPTX, H5P or another native file, run Python/Flask/Django/Snowflake/Power BI, connect a live service, send messages, or perform an authorized real-world action. Where the task requires a native source, actual observation or separate approval, retain that requirement and leave unsupplied evidence blank.
Prepare an original animal-classification activity in US English.
Learner/access context and required material format: [enter]
Stable animal/item IDs with authorized backbone trait evidence: [paste]
Separate teacher group keys, feedback and written-reason process: [paste]
Optional unknown-evidence discussion: [enter or NOT INCLUDED]
Use one stated criterion: backbone presence/absence. Original fixtures:
A01/Q1 dog, present => Vertebrate; A02/Q2 bony fish, present => Vertebrate;
A03/Q3 octopus, absent => Invertebrate; A04/Q4 spider, absent => Invertebrate. All four are animals. Habitat, legs and exterior hardness do not replace the
specified trait. Keep learner reasons blank and separate from checked group
choices; teacher reviews open text, not automatic semantic grading. A05 unknown evidence => Not enough evidence, outside the four-item score. Blank stays unanswered; retry allowed; one point per current correct checked item,
maximum 4. Repeat adds nothing; changed choice clears old feedback/count
immediately; reset empties choices/feedback/count. Keep original records intact. Do not invent specimens, images, actual learner work or mastery.
Return clean text-first cards/practice, separate keys and a later test checklist. Any HTML practice uses labeled native keyboard-accessible choices and text
feedback; no drag-only task, external collection or saved learner records.
COMPLETE AUTHORED SCENARIO AND EXPECTED CASES
The following is the supplied reading/teaching/calculation record to represent in the companion. Preserve its particular content, examples, source references and unknowns. Wording about a future native implementation refers to that native task, not permission to omit this HTML companion.
# Animals Interactive Worksheet: Classify from Backbone Evidence, Not Habitat
A fish and an octopus both live in water, but habitat does not decide which has a backbone. Give learners an explicit trait record, ask for a group choice and retain their explanation as a separate piece of evidence.
This original activity uses one criterion: **backbone present or absent**. It does not attempt a complete animal taxonomy or identify an unknown specimen from a photograph.
## Four original evidence cards
The cards use original wording based on the cited classification facts. They are teaching records, not observations from an actual specimen, X-ray, dissection or learner investigation.
| Animal record / item | Supplied trait | Separate teacher group key |
| --- | --- | --- |
| A01 / Q1: dog | Backbone present | Vertebrate |
| A02 / Q2: bony fish | Backbone present | Vertebrate |
| A03 / Q3: octopus | Backbone absent | Invertebrate |
| A04 / Q4: spider | Backbone absent | Invertebrate |
The teacher key contains **two vertebrates and two invertebrates**. All four are animals; invertebrate does not mean “not an animal.” Keep the animal ID, trait and group key linked throughout the material.
[Smithsonian's vertebrate-zoology description](https://naturalhistory.si.edu/research/vertebrate-zoology) identifies vertebrates as animals with backbones. [WHOI's teaching material](https://seagrant.whoi.edu/wp-content/uploads/2015/01/WHOI-E-01-002-DiSpezio-M.-Teaching-Materi.pdf) supports the corresponding examples and the distinction from animals without backbones. This activity uses that bounded trait distinction, not the older PDF's broader taxonomy or evolutionary ordering. Its artwork is not reproduced.
## Ask for a choice and a reason
For each card, provide labeled **Vertebrate / Invertebrate** choices and a blank written response to **“Which supplied trait supports your choice?”** Keep teacher keys separate from the clean learner copy.
The companion checks the group choice against the supplied key. The teacher reads the learner's written explanation. Do not require a single exact sentence or claim that software understood an open-text reason.
A separate bounded rule question can offer **Backbone presence / Water habitat / Has legs**. Its teacher key is **Backbone presence**. Use it to discuss which criterion this activity uses; keep it separate from the four animal-item score rather than adding an unexplained fifth point.
## Use the water comparison to test the rule
Compare A02 and A03. Both are aquatic examples, yet their supplied backbone traits differ. An answer based only on water therefore does not explain this grouping.
Original planned feedback for choosing Invertebrate on Q2 is:
**“A02 states that a backbone is present. Use that trait to choose its group; water habitat is not the rule here.”**
For choosing Vertebrate on Q3:
**“A03 states that a backbone is absent. Being in water does not make its backbone trait the same as A02's.”**
Give feedback about the chosen criterion, not a diagnosis of why the learner answered that way. A correct click paired with “because it lives in water” still gives the teacher an explanation to examine.
## Separate an outer covering from a backbone
A spider's exterior support is not a backbone. For this activity, A04's stated absence is the relevant evidence. Do not treat a hard-looking outside as proof of an internal backbone, or say that all invertebrates lack every form of support.
An original planned hint is **“Check the specific trait in A04. An outer covering and a backbone are different structures.”** Keep the question tied to the supplied record; no specimen image needs to reveal internal anatomy.
## Add an unknown-evidence discussion without guessing
An optional **A05** record says only **“Backbone evidence unknown.”** Its discussion answer is **Not enough evidence**. It is outside the four scored animal items.
The absence of a visible spine in an ordinary picture would not establish that a backbone is absent. Ask what evidence the record would need, rather than force this unknown case into Invertebrate. An unknown record is a reason to pause classification, not delete the record.
## Keep practice states distinct from actual achievement
For the companion’s four-item practice, a blank is unanswered. Permit retry. Give each currently correct, checked group choice at most one point, with a maximum of four; repeated checks must not add points. Changing a choice immediately clears its old feedback and checked-count contribution. Reset clears selections, feedback and the local count.
The two/two group totals describe the teacher key set, not an assumed learner score. If a group view contains no selected records, show an ordinary empty view while retaining the underlying cards. When adapting the companion, recheck its controls, keyboard focus, state messages and narrow-screen layout.
Record actual group choices, written reasons and support used in the required school workflow. Four selections do not establish complete taxonomy knowledge or automatic mastery.
## Copy a trait-evidence worksheet brief
Implement the local companion rather than returning a text-only plan. Preserve every numerical fixture and the distinction between illustrative expectations and actual evidence. Any native-runtime or classroom tests mentioned above remain tests to perform in the proper environment; do not mark them passed. Keep edits and practice responses in this open page only, without claiming persistent storage. Provide invalid/missing-input feedback and reset behavior that agree with this specific brief. Do not claim accessibility certification, learning gains, real approvals or test results that were not observed.
Compare A02 and A03 with their supplied traits, then walk the unknown A05 case with a teaching colleague before using the material. Keep actual learner explanations in the school's maintained record, and use the stated evidence rather than a habitat shortcut when discussing each classification.