Question 21 - Writing Practice Test for the PERT

Which sentence would make the best topic sentence for the paragraph?

(1) The smallest species is the fairy penguin. It has blue wings, instead of the normal black wings. (2) The chinstrap penguin has a black row of feathers across his white chin. (3) Penguins live an average of fifteen to twenty years. (4) The king and emperor have similar orange markings on the sides of their heads. (5) Although both are large species of penguins, and their markings are similar, the emperor is the larger species.