Data corresponding to three different populations of a land snail species are tabulated below. Each population inhabits a different region within the boundaries of a U. S. national park, and at this time, no migration takes place between any of the populations. Which of the following predictions is most likely if migration suddenly becomes possible between populations B (Population size 180, number of alleles per gene 1.6) and C (Population size 1064, number of alleles per gene 5.1)? A. The average number of alleles per gene for population B will increase but will decrease for population C. B. The average number of alleles per gene for both populations A and B will decrease. C. The average number of alleles per gene for all populations will increase. D. The average number of alleles per gene for population C will decrease but will increase for population A.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

explanation:

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.

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.