The relationship of living things and their environment

What ecologists study

How ecology studies

Why men study ecology ?

The balance of nature

The balance of nature
Water cycle

The balance of nature
Carbon dioxide cycle

Nitrogen cycle
The balance of nature

Energy cycle
The balance of nature

Food chain
The balance of nature

Marine food chain
The balance of nature

Organisms that live together

Relationships helpful to one organism

Relationships helpful to both organism

Relationships harmful to one organism

Нанесение экономического ущерба в морских экосистемах.
Загрязнение морской среды
вследствие вторжения человека
в баланс природы