Zachary Elliott's Paradox Institute has created a series of straight-forward biology lessons to make sense of the reckless (and sometimes intentional) confusion promulgated by transgender ideology. Here is the mission statement of Paradox Institute:

In an age where the very existence of male and female are being denied, the Paradox Institute provides evidence, reason, and above all, clarity to both simple and complex topics in the biology of sex.

The content presented is directly informed by contemporary scientific literature from the fields of evolutionary and developmental biology, endocrinology, personality psychology, and neuroscience.

Each video contains a short description and citations to scientific resources.

For example, here is why "Chromosomes are not Sexes."

Description:

Some claim that rare chromosome combinations prove there are more than two sexes, yet these combinations still result in males and females, not new sexes.

Here's one more video of the many available:

"Origins of Two Sexes"

Description:

This video essay explores the origins of the two sexes: how they formed 1.2 billion years ago and why they are nearly universal across the plant and animal kingdoms. The information for the video comes from peer-reviewed sources in evolutionary biology on the evolution of sex, anisogamy, and the two sexes.