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The chain is linked in this order:
Producers ##rarr## Consumers ##rarr## Decomposers
The Food chain begins with the producers .
There are different types of consumers:
The animal that eats Producers ##rarr## Primary Consumer
The animal that eats Primary Consumer ##rarr## Secondary Consumer
The animal that eats Secondary Consumer ##rarr## Tertiary Consumer
In some cases there is an animal that eats the Tertiary Consumer; it’s called a Quaternary consumer.
Now each plant and animal you see in the image above will die one day. Just like every human(also type of consumer) dies one day. That is a fact. That’s how nature works.
So when the producers the snail the frog or the fox dies the decomposers come to the scene and break down the organism into smaller parts. That’s when we say something decomposes.
The decomposers are usually and fungi .
This is a process that also releases smelly gases like ammonia . So animal carcasses (dead bodies) start to smell when decomposers get to work.
But why exactly are these bodies broken down? That’s because the chemicals which the dead bodies contain can go into the soil and then nourish new producers so that it can then provide energy to new consumers.
This is a cycle of how energy is recycled on earth. Because since the day the earth was formed no energy has been added to or taken away from the planet. The same is being used over and over again. And decomposers play an important role in that cycle.
Usually a food chain isn’t that simple. In an area it’s a complex web of many hundreds thousands of organisms which have an inter relationship with one another. In this way a single organism can be a secondary consumer and a tertiary consumer simultaneously.
Such as the fox in the example below:
Secondary: Oak tree##rarr##Squirrel##rarr##Fox
Tertiary: Leaf litter##rarr##Earth worm##rarr##Wood mouse##rarr##Fox
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