We are mammals living within a natural environment so have instinctual impulses hardwired into our brains.

Our identity is than laid over top of this so gender and sexual identity is partly aquired after birth.

It is a dance between what was "before" and what came "later" but the later is built on top of the foundation of the "before" so does not stand independent of it. (you cannot escape your biology)

Sexual identity is strongly influenced by prenatal hormones and womb environment so homosexual versus heterosexual "impulses" are created before birth.

What someone does with these impulses is another matter because they can "to a point" be consciously ignored and resisted but the person will experience dissonance between doing what feels "natural to them" and what they are trying to force themselves to do, creating a push pull tension inside them.

Environmental toxins have a profound impact on the fetus through the mother and everything from her smoking, diet, alcohol to emotional stress will impact fetal development.

The mother largely decides the shape of the childs future experiences.

One example is Polycystic Ovarian syndrome which is said to affect ten percent of women and may be a contributing factor to the rise in autism and ADHD in children, which in my opinion is tied to hormonal changes during fetal development creating vulnerabilities after birth.

This is handed down genetically but probably is due to epigenetic causes so once it is "switched on" the problem becomes how to "switch it off"

Another is how estrogen as oral contraceptives affects her long term body chemistry and whether this can cause permanent epigenetic changes so she is changing her "genes" by switching them on or off and this carries on to the children she produces.

Hormones have the potential to permanently alter the human genome in ways nature never intended.

Those with xy chromosomes are more vulnerable to genetic disturbances than those with XX because damage to one X is made up by the other X and this is one reason you see certain mental disturbances in higher proportions with those who have XY versus XX

Identity accquistion is strongly determined by the brain structure which is strongly determined by hormones which is determined by the mothers own chemistry that acts on her genetics by making epigenetic changes to her.

There are a number of biological markers that trans and homosexuals show that differ from cisgenders and heterosexuals so everyone is "created" as what and who they are "naturally" just as there are biological markers for autism, williams syndrome or any of hundreds of other variations in nature.

In nature there really is no "normal" but instead huge variety but through human behavior we are affecting "nature" so affecting what nature "creates" which is "us"

Nature always creates based on the environment that life finds itself living in, so life creates life to the degree it affects its environment.

Human behavior has fundamentally altered nature in ways never before seen in nature.

Hormones may be the way life and environment "talk" to each other so that changes to the genetic structure through epigenetic changes can be made to inhance survival of life.

By changing the chemical environment we have disrupted this conversation confusing "nature"

We live within a inescapable closed system

It should be an interesting ride if we survive it.