THE LIVING WORLD PATH

Start with life.
Climb through four biology levels.

A single game-like route begins with accessible foundations and builds toward advanced biological systems. Finish lessons to unlock the next node; mistakes automatically become spaced review.

Not sure where to begin? Find your level →

96 units760 lessons4,200 challenges

BIOLOGY LEVEL

Level 1 Biology · foundations of living systems

0/21 mastered

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LEVEL 1 · UNIT 01

Characteristics and classification of living organisms

0 / 5 lessons · 28 min

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LEVEL 1 · UNIT 02

Organisation of the organism

0 / 5 lessons · 28 min

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LEVEL 1 · UNIT 03

Movement into and out of cells

0 / 5 lessons · 28 min

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LEVEL 1 · UNIT 04

Biological molecules

0 / 5 lessons · 28 min

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LEVEL 1 · UNIT 05

Enzymes

0 / 5 lessons · 28 min

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LEVEL 1 · UNIT 06

Plant nutrition

0 / 5 lessons · 28 min

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LEVEL 1 · UNIT 07

Human nutrition

0 / 5 lessons · 28 min

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LEVEL 1 · UNIT 08

Transport in plants

0 / 5 lessons · 28 min

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LEVEL 1 · UNIT 09

Transport in animals

0 / 5 lessons · 28 min

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LEVEL 1 · UNIT 10

Diseases and immunity

0 / 5 lessons · 28 min

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LEVEL 1 · UNIT 11

Gas exchange in humans

0 / 5 lessons · 28 min

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LEVEL 1 · UNIT 12

Respiration

0 / 5 lessons · 28 min

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LEVEL 1 · UNIT 13

Excretion in humans

0 / 5 lessons · 28 min

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LEVEL 1 · UNIT 14

Coordination and response

0 / 5 lessons · 28 min

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LEVEL 1 · UNIT 15

Drugs

0 / 5 lessons · 28 min

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LEVEL 1 · UNIT 16

Reproduction

0 / 5 lessons · 28 min

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LEVEL 1 · UNIT 17

Inheritance

0 / 5 lessons · 28 min

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LEVEL 1 · UNIT 18

Variation and selection

0 / 5 lessons · 28 min

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LEVEL 1 · UNIT 19

Organisms and their environment

0 / 5 lessons · 28 min

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LEVEL 1 · UNIT 20

Human influences on ecosystems

0 / 5 lessons · 28 min

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LEVEL 1 · UNIT 21

Biotechnology and genetic modification

0 / 5 lessons · 28 min

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BIOLOGY LEVEL

Level 2 Biology · molecules to systems

0/11 mastered

LEVEL 2 · UNIT 01

Cell structure

0 / 5 lessons · 28 min

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LEVEL 2 · UNIT 02

Biological molecules

0 / 5 lessons · 28 min

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LEVEL 2 · UNIT 03

Enzymes

0 / 5 lessons · 28 min

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LEVEL 2 · UNIT 04

Cell membranes and transport

0 / 5 lessons · 28 min

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LEVEL 2 · UNIT 05

The mitotic cell cycle

0 / 5 lessons · 28 min

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LEVEL 2 · UNIT 06

Nucleic acids and protein synthesis

0 / 5 lessons · 28 min

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LEVEL 2 · UNIT 07

Transport in plants

0 / 5 lessons · 28 min

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LEVEL 2 · UNIT 08

Transport in mammals

0 / 5 lessons · 28 min

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LEVEL 2 · UNIT 09

Gas exchange

0 / 5 lessons · 28 min

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LEVEL 2 · UNIT 10

Infectious diseases

0 / 5 lessons · 28 min

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LEVEL 2 · UNIT 11

Immunity

0 / 5 lessons · 28 min

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BIOLOGY LEVEL

Level 3 Biology · control, energy and change

0/8 mastered

LEVEL 3 · UNIT 01

Energy and respiration

0 / 5 lessons · 28 min

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LEVEL 3 · UNIT 02

Photosynthesis

0 / 5 lessons · 28 min

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LEVEL 3 · UNIT 03

Homeostasis

0 / 5 lessons · 28 min

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LEVEL 3 · UNIT 04

Control and coordination

0 / 5 lessons · 28 min

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LEVEL 3 · UNIT 05

Inheritance

0 / 5 lessons · 28 min

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LEVEL 3 · UNIT 06

Selection and evolution

0 / 5 lessons · 28 min

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LEVEL 3 · UNIT 07

Classification, biodiversity and conservation

0 / 5 lessons · 28 min

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LEVEL 3 · UNIT 08

Genetic technology

0 / 5 lessons · 28 min

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BIOLOGY LEVEL

Level 4 Biology · integrated advanced biology

0/56 mastered

LEVEL 4 · UNIT 01

Evolution, the Themes of Biology, and Scientific Inquiry

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 02

The Chemical Context of Life

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 03

Water and Life

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 04

Carbon and the Molecular Diversity of Life

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 05

The Structure and Function of Large Biological Molecules

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 06

A Tour of the Cell

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 07

Membrane Structure and Function

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 08

An Introduction to Metabolism

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 09

Cellular Respiration and Fermentation

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 10

Photosynthesis

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 11

Cell Communication

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 12

The Cell Cycle

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 13

Meiosis and Sexual Life Cycles

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 14

Mendel and the Gene Idea

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 15

The Chromosomal Basis of Inheritance

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 16

The Molecular Basis of Inheritance

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 17

Gene Expression: From Gene to Protein

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 18

Regulation of Gene Expression

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 19

Viruses

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 20

DNA Tools and Biotechnology

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 21

Genomes and Their Evolution

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 22

Descent with Modification: A Darwinian View of Life

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 23

The Evolution of Populations

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 24

The Origin of Species

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 25

The History of Life on Earth

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 26

Phylogeny and the Tree of Life

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 27

Bacteria and Archaea

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 28

Protists

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 29

Plant Diversity I: How Plants Colonized Land

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 30

Plant Diversity II: The Evolution of Seed Plants

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 31

Fungi

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 32

An Overview of Animal Diversity

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 33

An Introduction to Invertebrates

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 34

The Origin and Evolution of Vertebrates

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 35

Vascular Plant Structure, Growth, and Development

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 36

Resource Acquisition and Transport in Vascular Plants

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 37

Soil and Plant Nutrition

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 38

Angiosperm Reproduction and Biotechnology

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 39

Plant Responses to Internal and External Signals

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 40

Basic Principles of Animal Form and Function

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 41

Animal Nutrition

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 42

Circulation and Gas Exchange

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 43

The Immune System

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 44

Osmoregulation and Excretion

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 45

Hormones and the Endocrine System

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 46

Animal Reproduction

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 47

Animal Development

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 48

Neurons, Synapses, and Signaling

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 49

Nervous Systems

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 50

Sensory and Motor Mechanisms

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 51

Animal Behavior

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 52

An Introduction to Ecology and the Biosphere

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 53

Population Ecology

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 54

Community Ecology

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 55

Ecosystems and Restoration Ecology

0 / 10 lessons · 70 min

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LEVEL 4 · UNIT 56

Conservation Biology and Global Change

0 / 10 lessons · 70 min

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