Hard-2 pushes kindergartners further into animal characteristics with mixed-format practice. Part A presents four multiple-choice questions, including identifying which trait is NOT a mammal characteristic, recognizing frogs and salamanders as amphibians, and spotting a cold-blooded animal. Part B then offers five fill-in-the-blank sentences about how warm-blooded animals control body temperature, how cold-blooded animals rely on the sun, and which groups — birds, reptiles, and fish — share the habit of laying eggs.