The role of antibodies in the human body is to A. stimulate pathogen reproduction to produce additional white blood cells
B. increase the production of guard cells to defend against pathogens
C. promote the production of antigens to stimulate an immune response
D. recognize foreign antigens and mark them for destruction

D recognize foreign antigens and mark them for destruction.

Explanation:

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.