Which of the following do mosses and ferns have in common? Check all that apply.
sporophyte generation
gametophyte generation
sperm cells are wansported by air to egg cells
sperm cells are transported by water to egg cells
spores are transported by air
spores are transported by water
DONE

i think the answer is a.keratin is the pigment responsible for skin color.

all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

hope it ,

bioteacher101

because it travels in smaller waves then all other colors, causing it to be the most visible color