Which feature is characteristic of an alpine tundra a. peat moss b. stunted trees c. hardwood trees d. bare rock

The answer is bare rock. -Apex

D. Bare Rocks

An alpine tundra is a biome that does not contain trees because of the high elevation. It is occupied by are succulent plants, storing water in their leaves (waxy leaves that prevent desiccation) and mosses. The biome exhibit cold environmental conditions and rock bearing land.

answer and explanation;

volcanic rocks are igneous rocks which form from lava, molten rock which has been thrust out of a volcano onto the surface of a rocky body such as an asteroid, planet, or dwarf planet.  

plutonic rocks are igneous rocks which form from subterranean chambers of molten rock or magma. plutonic rocks make up the base of continental crust as well as oceanic crust. their slow rate of formation causes them to be coarse grained since there is plenty of time for large crystals to form before the magma solidifies into rock.

the textural difference is that plutonic rocks are more coarse grained than volcanic rocks. plutonic rocks are coarse grained while volcanic are fine grained ; glassey or fragmental. since fine and coarse are adjectives the decision as to whether a rock is fine or coarse grained is generally made on the bases of whether or not the individual crystals can be seen in most if the rock.

yes, because even though a theory has a  lot of evidence to support it, it is not always true