Select the correct answer from each drop-down menu. green lizards were observed in the region in the image. changes in the geography of the region caused the formation of a stream, which divided the region into two halves. the left half developed a dark green environment, and the right half a comparatively lighter green environment. as a result, two geographically isolated populations, dark and light green lizards inhabited either side of the stream. a stream running between two grassy regions the region on the right has more light green lizards as a result of . the new species will develop by way of .