When an organism joins a new population, its genes become part of the new population's gene pool. How does this gene flow affect populations? Gene flow between populations has no effect on the gene pool.
O Gene flow between populations increases genetic diversity over time.
O Gene flow between populations decreases genetic diversity over time.
Gene flow increases the chance for reproductive isolation which can cause new species to form.
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because if u just bring in genes into a new inviroment and the other genes are not like other ones it will mess up everything

Explanation:

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.