Two species of garter snakes live in the same geographic area. one species mainly lives in water and the other mainly on land so that they rarely encounter each other and do not interbreed. this is an example of what type of reproductive isolation?

If you mean:  "genetic isolation" (not: "reproductive isolation");  

then, this is an example of:  "ecological isolation"; or, "geographic isolation" .

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

C. chemical changeshope i : )