Introduction 5
The seashore 6
Plants of the seashore 7
Animals of the seashore 8
Life on the surface of the sea—the plankton 13
Plant plankton 13
Animal plankton 14
Sea plants 15
Sea animals 16
Animals of the seabed 21
Animals of the deep sea 25
Mammals of the sea 26
The food chain 28
Dangerous sea animals 29
Survival in the sea 30
Man's future and the sea 32