What do all plant life cycles have in common?

All plants have alternation of generations: their life cycles switch between a haploid phase and a diploid phase. The diploid sporophyte is produced after fertilization, not by meiosis, so A is incorrect. Fertilization does not always produce seeds, and sperm do not always travel by wind, so C and D are not true of all plants.

AI-written and checked against the verified answer.