What are the main functions of pollen? select all that apply. select all that apply. protection of the male sporophyte delivery of the sperm to the female gametophyte protection of the male gametophyte nutrition of the male gametophyte

- Delivery of the sperm to the female gametophyte  

- Protection of the male gametophyte

Explanation:

The pollen grain is a microspore present in angiosperms and gymnosperms, it contains the male gametophyte.

The pollen tube present in pollen grains and the way they are transported (by wind) allows these plants to require no water for reproduction.

In addition, the pollen grain has two very resistant walls (internal and external), composed mainly of cellulose, ensuring protection to the male gametophyte until it meets the female gamete.

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.

i think it is d. objects resist changes in their state of motion.