How does all this affect wildlife?
A food chain shows how different organisms feed off each other.
A Food Chain
All food chains start with plants that need sunlight to grow. They are called producers.
Other living things then feed on the plants, and they are then eaten by something else. This means the energy from the sun can be used by all the living things in the food chain.
Here is an example you might find in a garden. Lettuce uses the sun's energy to grow, the lettuce is eaten by the slug, which is eaten by the bird, which is in turn eaten by the cat. So the cat is making use of the sun's energy.
A food chain shows how different organisms feed off each other.
Now let's see if you can work out a food chain found near the gas rigs at sea...