This method ensures that each parent passes on some of their traits to the next generation without doubling the number of chromosomes present. You can see how that would be a problem. There are 23 pairs of chromosomes in humans, if the number was not cut in half in eggs and sperm, the second generation would have 46 pairs of chromosomes, and the number would double in each successive generation, could get messy. Well, first of all, the atmosphere of Uranus is mostly methane gas. This is actually caused by a strange alergy called allergic conjunctivitis, which involves inflamation of the lower eyelid.
Optical illusions occur when the brain misinterprets visual signals.
Also, the air forms an atmosphere around the Earth, which protects us from harmful rays from the Sun. It cools down when energy leaves the molecules and goes into something else, like the ground. Well, from a human's perspective, you're just about right. Mosquitoes can spoil an otherwise pleasant summer evening by their persistant harassment of us in an effort to suck our blood. And in some parts of the world, mosquitoes can be dangerous because they can carry deadly diseases, like malaria.