The first angiosperms appeared approximately 100 million years ago, but, since their appearance, they have become the dominant group of plants on the planet.
Sepals look leaf-like.
Their function is to protect the other flower parts when the flower is in the bud stage. Petals are usually brightly colored. Their function is to attract animal pollinators. The third flower part is the stamens. As can be seen in the stamens in the image, the bottom portion of the stamen is called the filament, and the enlarged top part is called the anther.