premise: Maternal effects on development can be investigated by placing half an embryo into one kind of female and the matching identical half into another.
hypothesis: Invertebrates (and higher animals) can also be placed in one of two groups based on how they develop as embryos.
hypothesis_graph_structure: Invertebrates (and higher animals<>can be placed<>$$$two groups<>based<>on how they develop as embryos$$$they<>develop<>