Researchers studying a genetic disease use DNA sequences from a large group of both healthy people and people suffering from the genetic disease. The genetic disease is caused by a mutation in a single gene.
Why does it benefit researchers to use two groups of people?
By using both groups, the researchers can determine if it is the same mutation causing the disease.
By using both groups, the researchers can investigate each person individually and determine the fitness of the individual.
By using both groups, the researchers can hypothesize which mutations will arise and cause the disease to evolve.
By using both groups, the researchers can conclude how a person's lifestyle is impacted by repeated testing.

a. seed plant structure. 1. the three main plant organs are roots, stems, and leaves. a fourth kind of tissue, meristematic tissue, is responsible for plant growth. meristematic tissue is the only plant tissue that produces new cells by mitosis. plants can lose water out of their leaves as they exchange gases with the air

explanation:

i won't lie i don't know so go online and ask google thats what i do

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.