What is this? Please have an explanation for your answer

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

How are the reproductive cycles of a fungus and a pteridophyte similar? a)both organisms form fruiting bodies that produce diploid seeds. b)both organisms produce haploid spores and exhibit diploid and haploid stages. c)both organisms reproduce sexually when two haploid hyphae fuse. d)both organisms exhibit a diploid stage and are only able to reproduce asexually.

What is the main fuel source for the work of the cell