What conclusion can you make about the skeletal structure of these two organisms?

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Which terms are used to identify pure substances

Which organism develops breathing organism develops breathing organs from pharyngeal arches? shark, spider, sea star, sea horse