Why do lichens and mosses get mostly replaced by larger plant species during succession?

Lichens and mosses are usually the pioneer plants that are found on barren lands. The two have the ability to survive in this kind of environment because of their minimal energy needs. When lichen and mosses died off, they are usually replaced by bigger plants because they have made the place suitable for the growth of larger plants. The dead parts of lichen and mosses decompose and turn into small particles of soil, this allow other plant species to grow in this location.

Iam not sure but to me it with be a or dsorry if i was late! hope this ! : )if you really want me to find out the answer that is correct tell me and i will do more research but the a or d makes sense to me.

Copper and gold have a high electrical conductivity