As is true of the gametophytes of all land plants, the gametophytes of true mosses lack stomata. Yet, the feather moss Pleurozium harbors nitrogen-fixing cyanobacteria. Which of the following is a feature of moss gametophytes that is most important for the continued survival of these cyanobacteria in the tissues of the feather moss gametophyte?

The Kingdom Plantae first appeared about 410 million years ago when green algae transitioned from water to land. The differences between land and sea posed a challenge to early colonizing species, which prompted many new adaptations. These adaptations have resulted in the wide variety of plant forms observed today.

There are an estimated 250,000 species, with the greatest diversity in the moist tropics.