GRADE 3 SCIENCE
🔎 Unit 2: Types of Living Things: Animals
Interactive Classroom Simulation â€Ē Pure English Edition
📖 Original Book Pages
⭐ 0 / 15 Stars

ðŸĶī Animals with Backbones (Vertebrates)

Every vertebrate has a skeleton made up of bones. The backbone consists of many small bones (vertebrae) that allow the animal to bend and move.

📖 View Page 12 in Book

🔎 Interactive Backbone Flexer

Bend Left (-45°) Angle: 0° (Straight Spine) Bend Right (+45°)

ðŸ’Ą Notice how small individual vertebrae pivot and curve smoothly together without breaking the spinal cord!

⚡ Vertebrate X-Ray Bone Scanner

Elephant Skin
Outside Skin (0%) ⚡ X-Ray Power: 75% Glowing Skeleton (100%)
Inspect Bones:
🐘 Elephant: Heavy columnar limb bones and massive vertebrae support its body weight!

â€Ē The 5 Classes of Animals with Backbones:

Mammals 1. Mammals Have backbone, hair/fur, give birth to young
Amphibians 2. Amphibians Live in water & land, moist skin
Birds 3. Birds Have backbone, feathers, wings & beaks
Reptiles 4. Reptiles Scales on skin, backbone bends easily
Fish 5. Fish Live in water, breathe with gills, swim with fins

🐌 Animals without Backbones (Invertebrates)

Many small animals do not have a backbone. Some live in water, some on land. They have soft bodies, shells, or spiny skins.

📖 View Page 13 in Book

1. Animals with Spiny Skins

Rough skin with sharp needle-like spines. Bodies divided into five parts. Examples: starfish and sea urchins.

Starfish & Urchin

2. Animals with Shells

Soft bodies protected by a hard outer shell. Examples: snails and oysters.

Land Snail

3. Worms

All worms have soft bodies with no legs. Examples: earthworms, roundworms, and tapeworms.

Earthworm

ðŸĶ— Animals with Jointed Legs & Insects

These animals have many legs with many joints, bodies divided into parts, and a hard outer skin. Insects have 3 body parts: head, thorax, and abdomen!

📖 View Page 14 in Book
Spider Spider (8 Jointed Legs)
Butterfly Butterfly (Wings & Legs)
Crab Crab (Hard Outer Carapace)

Grasshopper External Anatomy Explorer

Grasshopper External Anatomy
ðŸ“Ą Antenna
👁ïļ Compound Eye
ðŸ›Ąïļ Thorax
ðŸŠ― Wings
ðŸĶĩ Jumping Leg
ðŸĨš Ovipositor
âœĻ Tap any anatomy pin to hear its role and function!

🐟 Fish: Underwater Respiration & Anatomy

Fish live in water. All fish have a backbone. They breathe through their gills, have protective scales, and swim with fins.

📖 View Page 15 in Book
Fish

ðŸŦ§ How Gills Breathe Underwater

1. Mouth Opens: Water rich in dissolved oxygen flows in.

2. Over the Gills: Water passes over feathery red gills where oxygen enters blood capillaries.

3. Gill Slits Open: Water without oxygen flows out through gill flaps.

Calm Water Swimming Speed: Medium Fast Current

🧭 Fin Navigation System

Tail Fin (Caudal) Provides forward thrust and swimming power!
Dorsal Fin Keeps the fish upright, prevents rolling.
Fins (Pectoral) Steers left, right, up, and down.
Scales Protective overlapping coat reducing friction.

ðŸļ Amphibians: The Double Life & Metamorphosis

An amphibian spends part of its life in water and part on land. Young amphibians breathe with gills in water. Adults breathe through lungs on land!

📖 View Page 15 in Book
1
Eggs in Pond Laid in water inside soft protective jelly
2
Tadpole (Gills) Lives in water, breathes through gills like a fish
3
Froglet (Lungs Form) Grows legs, lungs develop, gills shrink
4
Adult Frog (Land) Breathes through lungs & moist skin on land!

Stage 1: Egg Mass in Pond Water

Frog Stage

Female frogs lay hundreds of jelly-like eggs in calm fresh pond water. The eggs must remain moist and do not have hard shells.

⚖ïļ Young vs Adult Breathing Comparison

Trait Young (Tadpole) Adult Frog
Habitat In Water 🌊 On Land ðŸŒŋ
Breathing Organ Gills (like fish) Lungs + moist skin
Locomotion Swimming tail Four jumping legs

🏆 "Who Am I?" Science Challenge & Spin Wheel

Test your knowledge across all 4 pages! Answer riddles, earn stars, and spin the champion wheel!

Master Review

Riddle 1 of 6

Score: 0
"I have a backbone, scales on my skin, and I breathe underwater through my gills. Who am I?"

ðŸŽĄ Student Champion Wheel