Ferns and mosses are alike in what they can reproduce sexually only when

Ferns and mosses are alike in that they can reproduce sexually only- ((when a film of water covers the gametophyte)).

Explanation:

Mosses and fern both are non vascular seedless types of plants.

Ferns and mosses are alike in that they can reproduce sexually by releasing the millions of spores with the help of air and when a film of water is cover with sporangium.

Mosses and ferns reproduce sexually by producing sperm and eggs, the sperm is produced by the male gametophyte which should have the ability to swim so that it can reach the eggs, which are produced by the female gametophyte by swimming through a film of water for the fertilization.

After the fertilization sporophyte is formed, and it is dependent and connected on the gametophyte.

Spores are produced by the sporophyte, and it divide to produces gametophyte.

Thus that's why Ferns and mosses are alike and they can reproduce sexually in this way.

i don't know. if i were you, i would search it up online : d