E. Fill in the blanks
21. Animals are creation of_____that co-exist with us.
22. Birds have strong_______to flap their wings.
23. Reptiles like crocodiles and turtles can leave on_______and on water.
24. Mammals feed their young with milk produced by their______glands.
25._____are animals with backbones and they are classified into five smaller groups,
fishes, amphibians, reptiles, birds and mammals.​