An area with unifying characteristic is called as a region. The region is a broad geographic area, which is differentiated from other because of the similar features. In a region one or more than one types vegetational climax might be present. It is the continuous and extensive part of the surface. The area in a region is indefinite.
Hence, the given blank can be filled with region.
The answer that is true of meiosis is that D) it divides one diploid cell into four haploid cells.
Throwing waste in to water, or spilling anything in the water that's not supposed to be in the water
By means of natural selection.
I think natural could be the word