Answer: b. embryo protection
d. long periods of dormancy until good conditions provide nourishment
Step-by-step explanation:
Seeds can be defines as a fertilized ovule which contain an embryonic plant.
Seeds provide several advantages in plant sexual reproduction including embryo protection and long periods of dormancy until good conditions provide nourishment.
Seeds contain an embryo which furthur germinates into sporophyte. Seeds are served to protect the embryo when the embryo produces genetic variability and range.
Seeds remain in long period of dormancy until the favorable conditions for growth which is induced by desiccation and the hormone abscisic acid.
Hence, the correct answers are b. "embryo protection" and d. "long periods of dormancy until good conditions provide nourishment".