How do the chromosome number remains the same in the members of same species?

We'll use humans as an example since it's simple and relevant.
All healthy humans have 46 chromosomes (23 pairs of very similar chromosomes). When gametes are formed in meiosis, this number is halved, such that sperm and ovum have only 23 chromosomes (just one of each pair). When these gametes meet and fuse as a result of sexual reproduction, the 23 chromosomes from the ovum and the 23 chromosomes from the sperm combine to form the full set of 46.
Sometimes meiosis doesn't quite work perfectly, though. Downs Syndrome is an example of this (one gamete has both copies of chromosome 21, so after fusion with the other gamete there are 3 chromosome 21s!).

Because the earth is not round ,but it may seem round when viewed from ,our planet but true some points earth is not round was an oblate spheroid -a square that it squashed as globe however is not even a perfect oblate spheroid.in fact isaac newton's first proposed that earth was not perfectly round but it was an oblate spheroid instead.that mean a square that is squashed as its poles and swollen at the

1. aspect is nothing really because the answer is right in front of your face