A child cannot eat alone. He needs the help of his parents or guardians. At what stage of human development does he belong?

It takes place between age 12 and 18 and it is a critical turning point because it is when puberty takes place. What stage of human development is being referred to?

Most insects go through complete metamorphosis. How many stages does a complete metamorphosis have?

Butterfly undergoes a complete metamorphosis. Which of the following has the correct order of stages in the butterfly's life cycle? 

Frogs lay eggs that develop into tadpoles and then into adult frogs. What do you call the sequence of changes in the development of a frog?