If pollen consists of tiny grains that are the male sex cells of plants, then what does pollen consist of tiny grains of?

Answer choices:
- it helps plants in growing
 - the female sexual organs
 - Something with exactly eight protons
 - seeds
 - Microscopic organisms
 - the male sex cells of plants
 - bees
 - sub-units of species

 

      the male sex cells of plants    