The female XX was the original, the male arose from a mutation where a chunk was missing from one of the pair creating the XY look.
God didn't make two sexes. There are 2 sexes to increase genetic diversity. Organisms that reproduce asexually (having only one sex) are not as diverse and are therefore less able to adapt to their environment and thus reproduce continuing their species.
No, there are more than two sexes in the biological spectrum.
So we can reproduce.
Bi means Bisexual or Two. Bisexual means a individual liking both sexes and not just one.
If one is bisexual, it does not mean one have to be atracted to both sexes.
yes
Yes, waterboatmen have two sexes.
Male and female..
A gonochoristic animal is an animal that has just one of at least two distinct sexes. Most mammals are gonochoristic.
Biologically, there are two human sexes: male and female. However, there are also intersex variations where individuals may have physical characteristics of both sexes or do not fit strictly into male or female categories.
Yes, there are more than two sexes. In addition to male and female, there are intersex individuals who are born with variations in sex characteristics that do not fit typical definitions of male or female.
Some science-fiction stories speculate on life on other planets with 3, or perhaps 5, sexes. However, it would probably be more complicated to bring together representatives of all the 5 sexes.