Human height tends to follow a normal distribution. for example, 80 percent of men are somewhere between 5 feet 4 inches tall and 6 feet tall, with the largest number of men standing 5 feet 8 inches tall. smaller and taller heights are increasingly rare, as they become more extreme. for instance, less than 0.01% of the adult male population is greater than 7 feet tall or shorter than 3 feet tall.

humans have followed selection with regard to the evolutionary trend for height.

a) artificial
b) disruptive
c) stabilizing
d) directional

her next move would be to use agarose gel electrophoresis to separate the dna molecules of varying length and create a dna fingerprint.

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.