How do spores help the survival of spore-bearing plant? a)Spores can last for many years without beginning to grow.
b)Spores provide food for the plant in a harsh environment.
c)Spores attract animals to help with pollination.
d)Spores can help plants with photosynthesis.

it's D

Explanation:

When weather conditions are ideal, some ferns, algae, moss and even fungi, release spores into the air, often carried by the wind, by insects or birds until they land. Spores contain both male and female reproductive organs, which allows these plants to replicate themselves in a form of cloning.

layer 3 is younger than layer 6.

well, i believe that the answer is 2. : 3