Final answer:
A flower is made up of several parts, including the sepal, petal, stamen, and carpel. A complete flower has all four parts present, while an incomplete flower is missing one or more of these parts.
Step-by-step explanation:
A flower is made up of several parts, including the sepal, petal, stamen, and carpel. The sepal is the green outer part of the flower that protects the bud. The petal is usually brightly colored and attracts pollinators such as birds and insects. The stamen consists of a filament and anther and produces pollen. The carpel is the female reproductive part of the flower, which includes the stigma, style, and ovary. A complete flower is one that has all four parts (sepal, petal, stamen, and carpel) present, while an incomplete flower is missing one or more of these parts.