Reptile Roots Teacher Guide Reptile Roots
Teacher Facilitation Guide
Subject: High School Biology
Topic: Reptile Evolution & Geologic Time
Duration: 45-50 Minutes
Objectives
Investigate the evolutionary timeline of reptiles starting from the Carboniferous period.
Analyze the significance of environmental conditions (flora/climate) on reptile divergence.
Construct a scaled physical timeline of key reptile milestones.
Materials Needed
Reptile Roots Presentation
Geologic Time Travel Activity Strips
Reptile Reflection Journal
Rulers & Scissors
Tape or Glue sticks
Instructional Flow
5m
Warm-up: Earth 300 MYA
Display the slide showing Earth's ancient landscape. Ask: "What do you think the Earth looked like 300 million years ago? How would an animal need to change to live here?" Focus on the transition from water to land.
10m
Video: Evolutionary History
Watch the 'Evolutionary History' section (0:00-1:27). Instruct students to listen for three key periods: Carboniferous, Triassic, and Jurassic . Note the description of "dense ferns and shrubs."
25m
Activity: Geologic Time Travel
Students use the provided paper strips and rulers to build a 30cm timeline.
Scale: 1 cm = 10 million years.
Points to mark:
300 MYA: Carboniferous Divergence (dense ferns/shrubs).
200 MYA: Appearance of Order Chelonia (Turtles).
150 MYA: Appearance of Order Squamata (Lizards/Snakes).
5m
Closure: Reflection Journal
Prompt: "How did the dense forests of the Carboniferous period facilitate the rise of reptiles?"
Key Vocabulary
Carboniferous Period
359-299 million years ago; known for vast swamp forests and the divergence of early reptiles from amphibians.
Ectothermic
Animals that rely on external environment temperatures to regulate their body heat.
Order Chelonia
The taxonomic order containing turtles and tortoises, appearing ~200 million years ago.
Teacher Tips & Key Quotes
"Reptiles were the first animals to live entirely on land." — Use this to discuss the amniotic egg and water-tight skin adaptations.
"Evolutionary Stasis" — Note that Crocodilians (8:08) have remained relatively unchanged for 200 million years. Ask students why they think this is (successful body plan for their niche).
Check for Understanding:
Why did reptiles diverge specifically during the Carboniferous? (The video mentions dense ferns/shrubs providing a perfect terrestrial environment for expansion).
Timeline Activity Answer Key
Time (MYA) Timeline Distance (from 0) Event / Description 0 MYA 0 cm Present Day 150 MYA 15 cm Order Squamata: Lizards and Snakes first appear in the Jurassic.200 MYA 20 cm Order Chelonia: Turtles first appear in the Triassic. Very little change since.300 MYA 30 cm The Great Divergence: Reptiles evolve from amphibians. Flora: Dense ferns & shrubs.
Reptile Roots Presentation Reptile
Roots
The 300 Million Year Journey
Warm-Up
"Imagine walking into a forest 300 million years ago..."
The Big Question:
What did the Earth look like back then? What kinds of plants and terrain would you see?
Look for the graphic at 0:48 in the video!
Video Investigation
Embedded media
Focus Segment: 0:00 - 1:27 (Evolutionary History)
Listen For:
The name of the Geologic Period where reptiles diverged.
Descriptions of the flora (plants) in the environment.
The animal group reptiles evolved from.
Geologic Time Travel
LAB ACTIVITY
Your Mission:
Construct a scaled timeline of reptile history using your paper strips and rulers.
The Scale:
1 cm = 10,000,000 years
Example: 100 million years = 10 centimeters
Requirements:
Mark "The Present" at 0 cm.
Carboniferous Period (300 MYA)
Turtles / Triassic (200 MYA)
Lizards / Jurassic (150 MYA)
Annotating Your Map
Carboniferous
300 Million Years Ago
Flora:
Dense Ferns & Shrubs
Event:
Reptiles diverge from Amphibians.
Triassic
200 Million Years Ago
Order Chelonia:
Appearance of Turtles & Tortoises.
"Body structure has changed very little since then."
Jurassic
150 Million Years Ago
Order Squamata:
Evolution of Lizards & Snakes.
This group makes up 95% of living reptiles today!
Reflection Journal
Prepare to share your thoughts in your log.
"How did the dense forests of the Carboniferous period facilitate the rise of reptiles?"
Use vocabulary from today's lesson!
Geologic Time Travel Activity Geologic Time Travel
Reptile Evolution Timeline Activity
Name / Date
How to Build
Cut out the three timeline strips below and tape them together end-to-end to create one long 30cm strip.
Label the 0 cm mark as "Present Day."
Using the scale 1 cm = 10 Million Years , use your ruler to measure and mark the three key geologic events listed to the right.
Annotate each mark with a description of the environment or group.
Points of Interest
The Great Divergence
300 Million Years Ago
Identify the plants (flora) and environment that allowed reptiles to live entirely on land.
Order Chelonia
200 Million Years Ago
Label the period (Triassic) and the unique animal group that appeared here.
Order Squamata
150 Million Years Ago
Label the period (Jurassic) and the animal group that now makes up 95% of living reptiles.
Scale Conversion
1 cm = 10 MYA
Timeline Strip Template
Cut along the dotted lines and assemble into one 30cm strip.
Strip 1: 0 to 100 Million Years
Present (0)
100 MYA
Strip 2: 100 to 200 Million Years
100 MYA
150 MYA
200 MYA
Strip 3: 200 to 300 Million Years
200 MYA
300 MYA
Observation Notes
Event (MYA) Flora & Environmental Conditions 300 MYA (Carboniferous) 200 MYA (Triassic) 150 MYA (Jurassic)
Reptile Reflection Journal Scaly Stories
Evolutionary Reflection Log
Specimen Name
Closing Reflection
"How did the dense forests of the Carboniferous period facilitate the rise of reptiles?"
Response Area
Challenge: Incorporate Today's Vocabulary
Carboniferous Period
Terrestrial Adaptation
Divergence
Amphibian Ancestry
"Biology isn't just science, it's the way of life." — B