science year 4 animals

Science Year 4
Unit 3

Like human, animals take in oxygen and give
out carbon dioxide and water vapor when
they breathe.

Breathing Organs of Animals: Lungs

Most land animals breathe through their lungs.

monkeys

Elephant Bird Bat

Cow Porcupine

Snake

Breathing Organs of Animals: Lungs

There are some aquatic animals that also breathe using lungs.

Dolphin Crocodile Whale
Penguin Platypus Turtle

Breathing Organs of Animals: Book lungs

Book lungs are book-like breathing organs.

Spider Scorpion

Book lungs of a spider

Breathing Organs of Animals: Gills

Most animals that live in water breathe through gills.

Stingray

Shark Tadpole

Fish

Crab

Breathing Organs of Animals: Spiracle

Insects breathe through spiracles, which are
the tiny pores found at the abdomen.

Air enter the spiracles and carried to the cells
through trachea, which are tiny air

tubes that branch out to the whole body.

Ant Caterpillar

Mantis Cockroach Grasshopper Butterfly

Breathing Organs of Animals: Moist skin

Oxygen diffuses into the body of animals through their moist and thin skin.

Snail Earthworm

Leech

Breathing Organs of Animals: Lungs and Skin

Animals can have more than one breathing organs
These animals breathe through lungs and skin can live
on land and in water.

Frog Salamander

Newt Toad

Vertebrates

The animals that have a
backbone inside their
body.

Invertebrates

The animals that have no
backbone inside their
body.

Vertebrates
(Mammals)
• Breathing organs: Lungs

•Method of reproduction: Give birth

•Body covering: Fine hair

•Habitat: On land

Vertebrates
(Amphibians)
• Breathing organs: Lungs and moist skin

•Method of reproduction: Lay eggs

•Body covering: Moist skin

•Habitat: On land and in water

Vertebrates
(Fish)

• Breathing organs: Gills

•Method of reproduction: Lay eggs

•Body covering: Scales

•Habitat: In water

Vertebrates
(Birds)

• Breathing organs: Lungs

•Method of reproduction: Lay eggs

•Body covering: Feathers

•Habitat: on land

Vertebrates
(Reptiles)

• Breathing organs: Lungs

•Method of reproduction: Lay eggs

•Body covering: Scales or hard shell

•Habitat: Mostly on land

Notes in Bahasa Melayu
Organ pernafasan haiwan