A reproductive cell must differ from other normal body cells. The reproductive cell must because it will soon fuse with another reproductive cell to form a new individual

I'm not 100% sure what the exact answer is to this, because lots of things could be said about what gametes need to do for reproduction.

I suppose since it says that it's combining with another cell, it's hinting at the fact that reproductive cells are haploid.

If this is multiple choice I would choose the choice that has to do with gametes being haploid.

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.