A person is usually tallest about the age of 20. When a person stops growing in height, he begins to shrink due to a thinning of the pads of cartilage that grow between the bones of the backbone. Fruit Fly Metamorphosis. Insects develop through a series of stages. Each stage has a form very different from the others.
Metamorphosis is development by radical change.
Have students place a piece of a ripe banana in an open quart jar and leave it in a warm place for several days. If fruit flies are around, you will soon see them flying in the jar. You can purchase fruit flies from a biological supply company if you prefer. Place a piece of cheesecloth over the jar opening and keep it in place with a rubber band. Keep a record of the date the flies were secured in the bottle.