omfg partial derivatives of a summation of a log of a summation of a product of conditional probabilities.
"introduction" to artificial intelligence my ass.
Although the coelacanth itself isn’t a land walker, its fins do resemble those of its close relatives who first hauled their bodies onto land with the help of these sturdy, flexible appendages, acting as an evolutionary bridge to the landlubbers that followed. Over millions of years, that transition lead to the spread of all four-limbed animals, called ‘tetrapods’, like amphibians, birds, and even the mammals that are our ancestors.
From the TED-Ed Lesson The coelacanth: A living fossil of a fish - Erin Eastwood
Animation by James Price