Symbiosis or a symbiotic relationship is a close relationship between 2 species.  This relationship can be helpful to both of the species, helpful to one species and neutral to the other, or helpful to one and harmful to another.  Those types are mutualism, commensalism, and parasitism.  Mutualism is when both the species benefit from the relationship.  Commensalism is when one species benefits while the other is neutral and isn't helped or harmed.  Parasitism is when one species benefits and the other is harmed.  These 3 are the same in the way that they are all branches of symbiosis/symbiotic relationships.

The Savanna biome has an example of each set of symbiotic relationship.

Mutualism: Acacia Trees and Stinging Ants - the Acacia trees produce long sharp thorns.  The stinging ants carve out hollows in the thorns and feed on the nectar produced by the tree.  Whenever an animal tries to eat the branches, not only do they encounter sharp thorns but also they are attacked by stinging ants.  So the ants receive food while the tree receives protection.

Commensalism: Giraffes and Birds - the birds follow the giraffes around to eat their scraps, while the giraffe is unaffected.

Parasitism: Elephants and Baobab Trees - elephants use their strong trunks to tear away at the trunk of Baobab trees to receive their water supply.  The elephants are receiving water, but the Baobab is losing its water and its trunk.

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