Thanks for playing along.
"They are all more intelligent than an American toddler."
"eyeball pupil thingy" (see above)
"They are all animals." uh-oh
"All have at least tissue level organization, unlike sponges who do not have tissues." Uh-oh again, but for a different reason.
Indeed, the correct answer, as many of you know-rectangular pupils.
And for those of you who were not paying attention…