The body's natural defense against infection is called:

In terms of alternation of generations, the internal parts of the pollen grains of seed-producing plants are most similar to a ) moss sporophyteb) moss gametophyte bearing both male and female gametangiac) fern sporophyted) fern gametophyte bearing only antheridia

Ineed to know why d is the correct answer asap

How does the author's purpose in this passage differ from an author writing about her personal struggle living with asthma?