Pseudoscientific social control of the type the Nazis promoted for racism. Biology was never meant to dictate your behavior, it's science, it's study. Just like human biology confirms that other than minor differences in appearance that re-emerge throughout human history, we're all just the same homo sapiens sapiens, biology also does not support a black and white male/female absolute, there's much more than a chromosome involved in sexual development and assignment at birth is itself a human process. Humans also have complex brains, producing minds that result in way more complex behavior than would happen in reptiles or even in other mammals.
This includes creativity resulting in fantasy like religion, art, ideologies that can alienate people from their actual nature, but also a wide range of social and personal interactions and ultimately, the ability to develop knowledge about all of that, even if it's painstaking. And despite the efforts of some to deny, misrepresent and censor knowledge.
Science not only studies and documents our biology but also our behaviors and our history. Facts conflict with your pseudoscientific ideological arguments. That is not very surprising, since human traditions also conflict among eachother, this includes the contradictions of sacred scriptures even if they have been carefully selected by other humans. Other than sectarianism in each major religious current, there are the multiple religions, those that predated them, with their many deities.
News sources often include non-expert assessments and opinion pieces, but reliable ones still tend to discuss issues attempting a fair analysis, compared to outrage fabrication, advocacy and disinformation sources. Still, you'll find plenty of sexist bigotry and ignorance splipping in occasionally.
As for transgender people being able to fill the same jobs, consider all the cisgender who also adopt children for whatever reason, including infertility. Why should it be different?
The denial and fear mongering intended to repress don't rest on a sound basis, even if it can be effective to persecute. A good reason to fight bigotry, including pseudoscientific social control ideologies.