Purines; like adenine and guanine.
The correct answer should be A. spores
Ferns don't have seeds and they reproduce using spores. Cones have seeds in them and seeds fall out. Pollen enters a flower and then the flower becomes a fruit. This is sexual reproduction of plants. Since ferns don't have this, they have to reproduce with spores.
Answer:
Hydrogen atom of one molecule and carbon atom SPF another molecule
Change through natural selection
Hope this Helps (:
