The number 4, as soon as tonight .

There is a physical barrier (small village in a mountain valley) that does not let those traits to escape the region. In other words, the physical barriers prevent gene flow occurring. This is what makes that specific gene for polydactylism to be prevalent in that area.

hope this helped.

complete the square on the right side of the equation;

-5(x + 0)^2 + 15

answer: d. y = -x^2 + 15

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%