Lesson 1: Vertebrates vs. Invertebrates
Vertebrates vs. Invertebrates — 5E Lesson (50 minutes)
Georgia Standards of Excellence: S5L1 — Group organisms using scientific classification; compare vertebrates and invertebrates; identify major vertebrate groups.
ENGAGE (5 minutes) — Bell Ringer
Milestones‑style Question (single select)
1) A forest log is turned over. Students see an earthworm, a beetle, a frog, and a millipede. Which animal is a vertebrate?
Think–Pair–Share: In one sentence, explain how you chose your answer:
BRIEF INTRODUCTION (3 minutes)
All animals are placed into two big groups. Vertebrates have a backbone made of bone or cartilage. Their backbone protects the spinal cord and helps the body move. Invertebrates do not have a backbone. Many have other body supports, like a shell or hard outer covering. In this lesson you will build a simple model, sort examples, and use evidence to explain the difference between these two groups.
COMMON MISCONCEPTIONS (2 minutes)
- “Only big animals have backbones.” Size does not decide the group. Tiny fish and small lizards are vertebrates.
- “Insects are a type of reptile.” Insects are invertebrates. Reptiles are vertebrates with scales and a backbone.
- “If it has legs, it must be a vertebrate.” Many invertebrates have legs (insects, spiders, crayfish).
DEMO (5 minutes) — “Backbone Boost”
Materials
- 1 sheet of paper (left flat)
- 1 sheet of paper rolled into a tight tube and taped
- 1 book (thin)
Procedure
- Place the book on the flat paper. Observe how the paper bends.
- Place the book on the paper tube. Observe the support.
Point: A backbone adds support and protection, like the tube. The flat paper is like a body with no backbone.
EXPLORE (20 minutes) — Hands‑On Lab: “Build a Backbone”
Materials (groups of 3–4)
- 10–12 drinking straw pieces (2–3 cm each)
- 2 pipe cleaners (or string)
- 1 ruler
- Paper clips (6–8)
- Index cards (4)
- Tape and scissors
Goal
Model how a backbone helps an animal bend and protects soft parts, and compare to a body without a backbone.
Procedure
- Model A — “Backbone”: Thread straw pieces onto a pipe cleaner. Bend gently to make an “S.”
- Model B — “No Backbone”: Tape paper clips end‑to‑end to make a floppy chain the same length.
- Place each model across two stacks of index cards 10 cm apart. Hang 1 paper clip from the middle as a small weight. Observe shape and stability.
- Add more paper clips (one at a time) to the middle. Stop at 5 clips. Record how each model holds the weight and how it bends.
- Remove weights. Try to “protect” a rolled scrap of paper placed under the middle of each model. Which model keeps the paper safer?
Data Table
| Model | Max clips held before sagging a lot | Bending control (easy / medium / hard) | Protects paper under model? (yes / no) |
|---|---|---|---|
| Backbone (straw + pipe cleaner) | |||
| No Backbone (paper‑clip chain) |
Analyze & Explain (write in complete sentences)
- Which model acted more like a vertebrate body? Why?
- How did the “backbone” change movement and support in your test?
- Give one strength and one limitation of this model.
EXPLAIN (10 minutes) — Mini‑Lesson & Reference Chart
Key Ideas
- Vertebrates: Animals with a backbone and internal skeleton. Five main groups: fish, amphibians, reptiles, birds, mammals.
- Invertebrates: Animals without a backbone (insects, spiders, crabs, worms, jellyfish, and many more).
- A backbone protects the spinal cord and supports the body.
Quick Reference — Vertebrate Groups
| Group | Covering | Young | Example |
|---|---|---|---|
| Fish | Scales | Most hatch from eggs in water | Trout |
| Amphibians | Moist skin | Eggs in water; young often have gills | Frog |
| Reptiles | Dry scales | Most hatch from leathery eggs on land | Snake |
| Birds | Feathers | Hard‑shelled eggs | Hawk |
| Mammals | Hair or fur | Most born live; young drink milk | Bat |
Quick‑Check Formative Items (Milestones style)
- 2) Which body part best shows an animal is a vertebrate?
- 3) Multi‑select: Choose two invertebrates.
- 4) A student says, “A crayfish has a hard shell, so it must be a vertebrate.” What evidence corrects this claim?
- 5) Which vertebrate group has feathers?
ELABORATE (7 minutes) — Apply Your Learning
Sort each animal into the correct column and list one piece of evidence (covering, young, or body support).
Animals
- Sea turtle
- Cricket
- Red‑tailed hawk
- Earthworm
- Catfish
- Spider
| Vertebrates | Evidence |
|---|---|
| Invertebrates | Evidence |
|---|---|
EVALUATE (5 minutes) — Exit Ticket (5 Questions)
- 1) Circle one: A starfish is a (vertebrate / invertebrate). Give one reason: _____________________________
- 2) Which group includes animals with hair or fur?
- 3) Multi‑select: Choose two traits most likely found in invertebrates.
- 4) A student finds an animal with moist skin and eggs laid in water. Which group is it most likely in?
- 5) Write one sentence that compares vertebrates and invertebrates using correct science words.
Tags:
ANSWER KEY
Bell Ringer
1) C. Frog — Frogs have a backbone (they are amphibians).
Lab — Expected Results (may vary)
- Backbone model holds more weight before sagging, bends in a controlled way, and protects the paper better.
- No‑backbone chain sags early, bends in many places, and protects poorly.
Quick‑Check
2) B — Backbone.
3) A and C — Octopus, Grasshopper (both invertebrates).
4) B — It has no backbone.
5) B — Birds.
Elaborate (sample sort)
Vertebrates: Sea turtle (backbone; reptile), Red‑tailed hawk (feathers; bird), Catfish (backbone; fish).
Invertebrates: Cricket (exoskeleton), Earthworm (no bones), Spider (exoskeleton).
Exit Ticket
1) Invertebrate; no backbone (other correct evidence acceptable).
2) D — Mammals.
3) A and C — Exoskeleton; soft body with no bones.
4) C — Amphibians.
5) Sample: “Vertebrates have a backbone, but invertebrates do not.”
This lesson targets Grade 5 reading level and aligns with GSE S5L1.