Scientists have noted a decline in fungi species dating back to the early 1900s. annual crops of edible mushrooms in france and germany have declined since 1950. one hypothesis to explain this decline is that edible fungi are being overharvested. global warming and air pollution have also been considered as contributing to the decline. which of the following would exclude overharvesting as the cause of the decline? f similar declines among edible north american species g fungal-population increases in tropical regions h a parallel decline in non-edible species j high fungal numbers in nitrogen-poor soils

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.