Give the function of all of the following parts of a typical flower. a. Petals b. Stamen c. Pistil
d. Ovule
Please help.

The petals of a flower are usually brightly colored to attract pollinators such as bees, butterflies and hummingbirds. The stamen is the small body that holds and produces pollen. The pistil is the ovary of the flower. Ovules are the egg cells of a flower, which eventually become seeds.

Specific immune responses are triggered by antigens. Antigens are usually found on the surface of pathogens and are unique to that particular pathogen. The immune system responds to antigens by producing cells that directly attack the pathogen, or by producing special proteins called antibodies.