Biology — Types of Symbiosis
Mutualism, commensalism and parasitism.
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digraph Symbiosis {
rankdir=TB;
node [shape=box, style=rounded];
Symbiosis -> Mutualism [label="+/+"];
Symbiosis -> Commensalism [label="+/0"];
Symbiosis -> Parasitism [label="+/-"];
Mutualism -> "e.g. mycorrhizae";
Commensalism -> "e.g. barnacle on whale";
Parasitism -> "e.g. tapeworm";
}