What is the flaw of biological frameworks for sexuality?

One of the biological frameworks is gender essentialism which bases the gender of an individual on biology. The flaw to this framework is that not all individuals can be categorized as either female or male based on their biological features alone. Human biology is not perfect and some are born with two sex organs. "Sex change" is also now possible by removing and replacing reproductive organs. With these, it becomes difficult to determine the sexuality of an individual.

1. when the tempature rises,your sweat glands and then springs into action making perspiration. some sweat evaporates with your skin taling heat with it.2.some of the blood pumped by the heart travels by your lungs to get rid of carbon dioxide and pick up oxygen.3.saliva produces by, you drinking water which saliva is 98% of. when mucus builds up in your body it also creates saliva as well as, antibacterial compunds.4.when the core body tempature drops, the shivering reflex is triggered to maintain homeostasis. for example: when you get out the pool you start to shiver because it is cold.