These three variants of gender are the result of genetics and comprise a wide spectrum called "normal".
Females produce a gamete called an ovum aka "egg". This fuses with the male gamete which is called a sperm during sexual reproduction. The female gamete is larger gametes than that of the males.
Females and males are results of the anisogamous reproduction system. Anisogamy is a form of sexual reproduction where there is union or fusion of two gametes which are different in size and form. Anisogamy is predominant among multicellular organisms.
Intersex people are individuals born with any of several sex characteristics including chromosome patterns, gonads, or genitals that do not fit typical binary notions of male or female bodies.
That is it for the normal span of sexual beings upon the planet. There is another group who feel that they are born the wrong gender. This misconception is abnormal and results in a person who masquerades as a gender they are not. These deviants are called 'transgender' by their own declaration and they are abominations. They do not occur naturally.
Today is supposedly Transgender Day of Visibility. It is to recognize the sick individuals comprising the transgender community. Such is the day for a group who ignore their genetics and claim to assume a different gender than that assigned by their genome. These people are males who believe themselves to be females and females who believe themselves to be males. They think that they may achieve gender through the process of "feeling" that it exists and the fact that it is a figment of their imaginations is neither here nor there.
They manipulate their phenotype with cosmetics and surgery to give an appearance of the desired gender while remaining their genetic gender configuration all the while.
So March 31 is a dark day for the intellectual prowess of human beings who tout things which are impossible as an attribute to be admired. I have little tolerance for being in the presence of the deranged and this is precisely what transsexuals are: deranged. They don't even know what they are and can have little insight otherwise.
The international sphere is beginning to reject these people as the miscreants that they are. It was only a matter of time. In the USA where we celebrate the abnormal this condition is still supported by a bunch of overly permissive liberal individuals who choose to ignore reality and condone the so-called "transsexual" person and their mistaken take on reality.
The so-called transsexual is a person's mistaken amalgamation of bad body image and unrealistic fantasy. It is not a reality of the human condition beyond the confines of the individual's mental health. The rest of you may do as you will; but excuse me while I decline to put up with your trans idiocy. Instead of pursuing some misguided 'trans day of vengeance' you might consider getting a grip on reality.
The ability to be understood begins with your own understanding. It is obvious that understanding is lacking in the existence of transgender individuals. This militant turn with the murders of innocents in the news will only result in your downfall.