Lesson Plan

• Describe the key anatomical features of vertebrates and arthropods.
• Compare skeletal, nervous, circulatory, and respiratory systems between the two groups.
• Apply a feature‑based key to classify given organisms as vertebrates or arthropods.
• Construct a simple dichotomous key using observed characteristics.

• Projector and screen
• Printed comparison‑table handout
• Specimen set (e.g., fish, frog, beetle, spider)
• Classification worksheet
• Dichotomous‑key template sheets
• Whiteboard and markers

Begin with a quick poll: “Which animal group do you think shows the most diversity and why?” Connect this to prior lessons on basic animal classification. Explain that today students will use anatomical features to reliably sort organisms into vertebrates or arthropods, and they will be assessed on their ability to describe, compare, and apply a classification key.

1. Do‑now (5’) – Students list as many differences as they can recall between vertebrates and arthropods.
2. Mini‑lecture with slides (10’) – Review key features and the comparison table.
3. Specimen stations (15’) – Small groups examine provided specimens and record observations on the worksheet.
4. Guided classification (10’) – Using the feature checklist, groups label each specimen as vertebrate or arthropod.
5. Create a dichotomous key (10’) – Groups draft a simple key based on the observed traits and share with the class.
6. Exit ticket (5’) – Each student writes one definitive feature that distinguishes vertebrates from arthropods.

Recap the main distinguishing characteristics and highlight how the dichotomous key streamlined the classification process. Collect exit tickets to gauge understanding, and assign a short homework: students find an additional organism online, note its features, and classify it using the key.