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.

what map. im not blind are i?

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.