The fruit fly allows for the examination of one way that foraging behavior might have evolved. variation in a gene called forager (for) dictates how far drosophila melanogaster larvae travel when foraging. on average larvae carrying the forr ("rover") allele travel nearly twice as far while foraging as do larvae with the fors ("sitter") allele. how might the inheritance of these alleles impact the survival (fitness) of fruit flies? explain.

not sure if this is what you'r looking for eubacteria and archaebacteria

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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.