This test question is apparently designed to show you that the world is a cruel and unfeeling place. We really hope the rest of the test isn't like that or we're not going to be able to finish it without crying.
Right Triangle, Isosceles Triangle and Equilateral Triangle stopped inviting Wrong Triangle to their parties after he got too into reading conspiracy theories on the Internet. Square still cares about him though and tries to reason with him. Square's a good guy.
This kid seems to have cytoplasm confused with movie slime, which is an honest mistake. If he wanted full movie slime credit he should've mentioned Teenage Mutant Ninja Turtles II and Power Rangers: The Movie.