ACTIVITY 2: Identify the following sentences as true or false. 1. Monkeys, frogs, snakes, and fish are vertebrates. 2. All mammals use gills to breathe. 3. Both fish and reptiles have scales and lay eggs. 4. The insects have three body parts and eight legs. 5. The amphibians have moist skin, lay eggs in water and develop lungs and legs as adult. 6.Penguins are birds that cannot fly.​