premise: Incubation isfound almost exclusively in birds where the eggs are warmed sothis refers to caring for the eggs and keeping them warm.
hypothesis: Incubation is when birds keep their eggs warm while the embryos inside develop.
hypothesis_graph_structure: Incubation<>is<>when birds keep their eggs warm while the embryos inside develop$$$birds<>keep<>their eggs<>while the embryos inside develop$$$the embryos<>inside develop<>