Transgenders cannot objectively be the gender they claim they are:

I. Sex and gender aren't necessarily the sameFirst, let's look at the definitions of sex and gender to distinguish the difference between the two. Sex - either of the two main categories (male and female) into which humans and many other living things are divided on the basis of their reproductive functions. [1]Gender- either the male or female division of a species, especially asdifferentiated by social and cultural roles and behavior. [2]With this, we can already see a clear difference between sex and gender; sex refers to your biological traits, while gender doesn't. Now let's bring in the scientific evidence to prove the difference. For example, gender identity and sexual organs develop at different times during pregnancy, which can cause one to identify as the opposite sex that they were born as. "Testosterone production and the conversion of some testosterone to dihydrotestosterone between weeks 6 and 12 of pregnancy is critical for the initial development of male features, such as the penis, prostate gland, and scrotum. (Bao) In the absence of these male hormones, female genitalia develop instead. Brain development, however, does not occur in earnest until the second half of the pregnancy term, afterthe genitals have been developed, and the continued presence of male hormones results in a brain which has subtle, but critical physical differences from the female brain. (Bao)"The fact that the brain and the genitals develop at different times in the womb mean that a misalignment between the genitals and brain may develop, leading to either an intersex condition, or a transgender individual." [3]With this, we can conclude that sex and gender aren't always synonymous. II. Brain StructureIn this contention, I'll present two sources which prove that BST and white matter have been shown to prove theexistence of transgenderism. "In summary, our observations suggest that the small size of the BSTc in male-to-female transsexuals cannotbe explained by differences in adult sex hormone levels, but is established during development by an organizingaction of sex hormones, an idea supported by the fact that neonatal gonadectomy of male rats and androgenizationof the female rats indeed induced significant changes in the number of neurons of the BST and suppressed its sexual dimorphism."Considered together with information from animals, then our study supports the hypothesis that gender identity alterations may develop as a result of an altered interaction between the development of the brain and sex hormones. The direct action of genetic factors should also be considered on the basis of animal experiments." [4]To sum this up, this study used animal experimentation to show that gender identity can be determined by "altered interaction between development of the brain and sex hormones". In turn, genetics do have a large part in whether or not you'll identify as the opposite sex later in life. "Antonio Guillamon‘s team at the National University of Distance Education in Madrid, Spain, think they have found a better way to spot a transsexual brain. In a study due to be published next month, the team ran MRI scans on the brains of 18 female-to-male transsexual people who’d had no treatment and compared them with those of 24 males and 19 females."They found significant differences between male and female brains in four regions of white matter – and the female-to-male transsexual people had white matter in these regions that resembled a male brain 'It’s the first time it has been shown that the brains of female-to-male transsexual people are masculinised,' Guillamon says." [5]In this study, white matter shows that transgenders have a brain that resembles the brain of their cisgender counterparts. ConclusionIn conclusion, we can clearly see with the evidence above that transgenderism is in fact valid due to the difference between sex and gender and the various psychological aspects. Thank you. I look forward to my opponent's rebuttal. Citations[1]https://www.google.com...[2]http://www.dictionary.com...[3]http://transascity.org...[4] http://www.tgmeds.org.uk...[5] https://www.newscientist.com...