Here is a simple definition of BIODIVERSITY. It is important to give the children this definition to make them clear what they are going to work about and why it is important to take it into consideration.
A DEFINITION OF BIODIVERSITY
Biodiversity is the variability among living organisms from all sources, including terrestrial, marine, and other acquatic ecosystems and the ecological complexes of which they are part. This includes diversity within species, between species and of ecosystems.
Biodiversity is important in both human life and natural ecosystems.
Humans must be careful to take their decisions because these can affect the well-being of themselves and of the others.
The biodiversity of the ecosystems is the diversity of life in the different environments, such as the forest, the coral reef, the underground environments, the desert, the peatlands. If such environments disappear or if they are altered the species that live there risk to become extinct.
Just to give an example, think about the flies. If they disappeared, bats, birds and dragonflies would not have any more food and as a consequence they would disappear as well.So this simple example is clear to show the importance of each single specie, even the smallest.
People all over the world are cooperating to save biodiversity, having care of all living organisms from the biggest ones to the smallest ones.