convergently evolved eyes, cephalod pod eyes evolved very differently from tetrapods. cephalpod eyes evolved by forming an invagination of those tissues. whereas the tetrapods evolved as extensions of thier brain.
plus cephalopods eyes are more like a camera, the lens move back and forth, instead of changing shapes. they do have exceptions which allows them to simulate eyes of tetrapods. they also possess the ability to regenerate thier eyes too.
also for monotremes, have 5 pairs of sex chromsones 5x/5ys, and resembling BIRD sex dermination, ZW rather than mammals x and y.
calcification, the immune system, combined with the parasite walling off the infection. the parasite itself secretes chemicals to suppress the local immune system, thats why you dont see massive immune response to so many. if the parasites suddenly die it can be a problem for the host. theres also studies going on that non-deadly parasites are result of modulating autoimmune diseases as well.
Wait till you hear about Gympie gympie plant, which is related to stinging nettle but on steroids, and is more potent