Angiosperms are known as flowering plants. Gymnosperms are seed producing plants like trees that don’t have flowers, so that leads you to ferns and horsetails. Ferns have spores on them that they use to reproduce with and they don’t have flowers . -isboggio
I think it's D) atmospheric carbon dioxide.
Explanation:
the farmer make the soil fertility by the cultivated things if the land in not having soil fertility can not use for the agricultural if the use they well loss
