Which of these true statements could contribute to a plausible hypothesis for why the alternation of generations evolved in the earliest land plants? select all that apply. o many gametophytes tolerate desiccation. gametophytes lack the ability to form rigid (lignified) vascular tissues. the biopolymer sporopollenin first evolved to protect the diploid stage of green algae. it allowed one generation to specialize in fertilization and the other in dispersal.