Who came up with the idea of natural selection? where in the world were they when they came up with the idea?

Darwin came up with the idea. he has the idea when he traveled to the Galapagos Islands.

each of the 46 original chromosomes splits into two daughter chromosomes, so there are two sets of 46 daughter chromosomes that end up in each cell. human cells have 46 chromosomes. each chromosome consists of a pair of identical chromatids attached together by a structure called a centromere.