You didn't list any options but some of the things mosses and ferns have in common are:
they do not produces seeds
they don't produce flowers
they produce asexually be releasing spores,
Sand is granular and coarse meaning that water and nutrients can flow through it quite easily. Clay on the other hand has very fine particles that cling together to form a waterproof substance which traps/ stops any nutrients or water from moving down. Clay's also quite difficult for plants to get their roots into. Silt has a texture between clay and sand, meaning that it is the ideal substance as it allows the best water and nutrition movement in the soil. Most plants will grow best in silt, but there are some plants who are more adapted to living in sand (e.g. Marram grass) or clay.
<span>You would know you were in the troposphere if you see stuff like the clouds because it is earths lowest layer. </span>
