Ever since President Donald Trump rescinded an Obama administration order that required schools across the country to allow transgender students to use whatever bathroom they choose, many states and municipalities have reaffirmed their support for the transgender community. Tech companies are also joining in—today Yelp introduced a search filter that indicates whether or not an establishment has gender neutral bathrooms.

And now, even scientists are fighting back against transgender trolls.

Last night Facebook user Grace Ann (real name Grace Pokela), a biology teacher at Arlington High School in Lagrangeville, New York, saw this meme posted with the caption “In a sexual species, females have two X chromosomes and males have an X and a Y, I’m not a bigot it’s just science”:

Being a biologist, Grace was well-equipped to respond—so she posted a status poking a bunch of holes in the transphobic meme’s logic:

Not surprisingly, each of the scientific principles Grace cites is true:

Insects use an XO sex determination system, while birds use the ZW system.

A reptile’s sex is at least partly determined by the temperature in which the egg develops.

Flatworms transfer sperm through a process called penis fencing (which is described in graphic detail here).

In clownfish colonies, dominance is based on size, the female being the largest and the male being the second largest. If the female dies, the male gains weight and becomes the female for that group.

Other fish species take on female attributes while mating, and they release sperm in the process.

Fungi like molds and mushrooms have 36,000 sexes.

Humans also exhibit the wide range of sexual behaviors Grace discusses:

5-alpha-reductase deficiency is a real (albeit rare) condition, in which young women grow a penis during puberty.

Androgen insensitivity syndrome is an intersex condition in which a person who is genetically male is resistant to male hormones . As a result, the person has some or all of the physical traits of a woman, but the genetic makeup of a man.

The SRY gene is involved in male sexual development—without it fetuses can be genetically male (with XY chromosomes) but have a female body. The same is true in females (with XX chromosomes), who can develop a male body without the SRY gene.

XXY males are sterile, with small testes—while women with only one X chromosome (a condition called Turner syndrome) are infertile and don’t go through puberty. Males with two X chromosomes (called Klinefelter syndrome) are taller, with a higher risk of breast cancer and osteoporosis.

The post has already been shared almost 8,000 times and received almost 10,000 likes.

Pokela told the Observer that, like many people, she had become more politically aware after Trump’s election, and thus the transphobic post made her angrier.

“Facts have become so nebulous recently,” Pokela said in an email. “To see someone spouting such rage towards a truly oppressed group made me very upset. Using falsehoods to promote hate just rubbed me the wrong way.”

Fellow members of the science community (which has already marched against Trump and plans to again) also praised Grace’s detailed response. Some of the most notable comments include “