There is evidences of fatal science among chordates
Ans :
i) The chordates and the hemichordes had a common ancestor earlieas 500 mayor.
ii) There was also an extreme conservation of the phylotypic compartment map which could act as an evidence that development constrains future avenues. This is because after the compartments have been established whereby each compartment shows large flexibility.
iii) The structure of the fatal science among chordates mitigated the pleiotrophy problems/ conflating effects of those mutants whose actions could be beneficial.