The human evolutionary lineage
A lot of people misunderstand evolution. Evolution works by incrementally adding on new changes to existing gene pools through natural selection. A common misconception is that when a new organism evolves, it stops being what its ancestors were. This isn't the case. Instead, each new clade that evolves is the sum of its ancestors adaptations plus a new adaptation (and sometimes that new adaptation is the loss of an older adaptation). Clades are categories of life that are distinct from each other and when new features appear, scientists can name a new clade that is the sum of all previous clades plus the new feature. The Linnean taxonomy sustem with the ranks Kingdom, Phylum, Class, Order, Family, Genus, and Species is an older system of showing how clades nest and branch that isn't used by taxonomists anymore because 7 categories is not anywhere near enough to fully classify how many clades an organism is in. By following the evolution of clades an organism belongs to, you can see the different steps of its development into what it is now. I want to do that to humans. This isn't a 100% comprehensive list of clades or a comprehensive overview of human evolution.
You are in the clade Eukaryota because your cells have a membrane-bound nucleus that stores the DNA.
You are an Ophisthokont because the most basal form of you cells have a single flagella that pushes the cell forward. Many of your cells no longer fit this trait, but the sperm cell, one of the most basal cells, still retains this feature.
You are in the clade Holozoa because your cells cannot produce their own food.
You are in the clade Choanozoa because you are made of multiple cells with different functions working together.
You are an animal (The clade name is either called Animalia or Metazoa depending on who you ask) because you have an internal digestive cavity and must digest other living or recently living organisms to survive.
You are in the clade Eumetazoa (true animals) because your cells are organized into tissues and germ layers.
You are in the clade Bilateria because you are bilaterally symmetrical during embryonic development (and afterwards too, except for a few features).
You are in the clade Nephrozoa because your digestive tract starts with a mouth on one end and ends with an anus on the other end. Be glad you don't have to poop put of the same hole you use to eat.
You are a Duterostome because when you are an embryo, the first opening to form become the anus, when then opens a cavity through the embryo and out the other side to form the mouth. This means that once upon a time, you were nothing but a disembodied asshole.
You are a Chordate because you have a spinal nerve cord that runs down the back and (at least during embryo development) a notochord, pharyngeal slits, and a tail that emerges after the anus.
You are in the clade Olfactores because you have nostrils.
You are a Craniate because you have a brain enclosed in a skull.
You are a vertebrate because your spinal cord is enclosed in a skeletal sheathe that is divided into vertebrae.
You are a Gnathostome because you have a hinged jaw. These jaws started out as modified gill arches.
You are in the clade Osteichthyes (bony fish) because your skeleton is made of bone.
You are in the clade Sarcopterygii (lobe-finned fish) because you have muscular limbs supported by bones and lungs.
You are in the clade Rhipidistia because you have two symmetrical lungs.
You are a Tetrapodomorph because your shoulder articulates in a ball and socket joint.
You are a member of the clade Elpistostegalia because you have a shoulder girdle and do not have a dorsal fin.
You are in the clade Stegocephalia because your limbs have wrists and end in digits instead of fins, and because your spine is connected to your pelvis.
You are a Tetrapod because you have four limbs and skeleton adaptations that let you live on land permanently.
You are a Reptiliomorph because of the number of joints in your fingers and toes and because, barring accident or mutation, you have five digits per limb. You also have waterproof skin. Reptiliomorph means reptile-shaped, but you are not a reptile. The Reptiliomorphs predate true reptiles, which are on a different lineage than you.
You are an Amniote because you reproduce internally with a phallus (giving or receiving) instead of a female releasing eggs and the male then fertilizing them. The egg you came from was also encased in a sac of amniotic fluid.
You are a Synapsid because your ancestors had a single pair of holes in the skull called temporal fenestra. Humans no longer have this hole, but you can still feel the outline of where it was on the sides of your head. The Sauropsids, which would eventually include reptiles, are the sisters of the Synapsids.
You are a Eupelycosaur because your teeth are not all the same size.
You are a Sphenaconodont because your jaw can move side to side and forward and back instead of just opening and closing like a door. This grants you the ability to chew.
You are a Therapsid because you have the ability to shiver to warm up your body.
You are a Eutherapsid because your body is sustained at a temperature warmer than your environment.
You are a Neotherpasid because your legs are held under your body instead of being splayed out to the sides and because you have a spine the moved better forward and back instead of side to side.
You are a Theriodont because you have differentiated types of teeth including canine teeth in the front of your jaw. You also have a chamber in your nose for mucous membranes and 7 vertebrae in your neck.
You are a Eutheriodont because you have a secondary palate in your mouth that separates it from the nasal cavity. This means you can chew and breathe at the same time.
You are a Cynodont because your mandible is all one bone instead of multiple bones. The other bones that used to be part of the jaw are tiny remnants at the back. These bones would eventually evolve into the inner ear bones many clades later. You also have a heel on the back of your feet.
You are an Epicynodont because the teeth in the side of your jaw are differentiated into multiple types instead of all being the same shape.
You are a Eucynodont because you also do not have a parietal eye and because you do not have abdominal ribs, which allows for the presence of a diaphragm.
You are in the clade Prozostrodontia because your molars have two roots and are coated in enamel.
You are a Mammaliamoform because you were born toothless and grow only two sets of teeth in your life: baby teeth and adult teeth. Mammaliaform means "mammal-shaped" but they aren't mammals yet. There are still a few traits that need to evolve before true mammals showed up on the scene.
You are in the clade Mammalia because of the way your jaw articulated with the rest of the skull.
You are a Theriomorph because you have external ears instead of just holes in the sides of your head. The ancestors of the Monotreme and Platypus would have branched off somewhere around here because they don't have external ears.
You are a Trechnothere because of modifications in the elbow, scapula, and heel that help you move better.
You are a Cladothere because your ear canal goes through a coil instead of being a straight line.
You are in the clade Zatheria because you have nipples. Prior to theis, mammals had to sweat milk out of their pores for their young to lap up. Platypus and Echidnas still do this.
You are in the clade Tribosphenida because you or someone you know has a vagina and anus that are separate holes instead of being combined into a cloaca. Platypus and Echidnas still have a cloaca.
You are a Therian because you were born live instead of in an egg. Placental mammals and marsupials diverge at this point.
You are Eutherian because you were attached to a placenta while in utero.
You are a Placentalian because you do not have an epipubic bone. This allos babies to be born larger and more developed. You would think this would be the clade where placentas appear, but nope.
You are in the clade Boreoeutheria because you or someone you know has external testicles enclosed in a scrotum.
You are a Euarchontoglire. This clade has been established based on genetic rather than morphology. It divides into two groups: the Euarchontids and the Glires. You are on the Euarchontid side. The Glire side includes rodents.
You are a Primatomorph because you have adaptations like binocular vision and better balance that allow for life in the trees. These adaptations evolved independently in multiple lineages, a phenomenon called convergent evolution.
You are a primate because your eye sockets are fully enclosed by bone and you have opposable thumbs.
You are a Haplorrhine because your nose is dry rather than kept wet with mucus like a dog's.
You are in the clade Anthropoidea, sometimes called Simiiformes, because you do not have sensory whiskers but you do have color vision, breasts on the pectoral muscles, and you or someone you know has a naked penis that is not retracted into a sheathe. This is the clade for monkeys. Despite what you may have heard, you are a monkey.
You are in the clade Catarrhini, old world monkeys, because your nostrils face down instead of sideways, flat fingernails instead of claws, and tails that are diminished or gone all together.
You are in the clade Hominoidea, apes, because you have no tail and your shoulders can do a full rotation.
You are in the clade Hominidae, great apes, because you have fingerprints and the same structure you your eyes and ears as the other great apes.
You are a Hominine because you walk upright on the ground instead of knuckle-walking.
You are in the genus Homo, a human, because you have a large skull cavity allowing for a large brain that grants the ability to create complex languages, tools, and philosophy. Other human species include Home erectus (which may be our ancestors), Homo floresiensis (who only got about half as tall as we do as the result of island dwarfism), and Homo neanderthalensis (the Neanderthals, a cousin species to us which was closely related to us to allow for interbreeding. The majority of people alive today who are of European descent have some Neanderthal DNA in them).
Finally, you are in the species Homo sapiens, who originated in sub-Saharan Africa and spread throughout Eurasia in multiple successive waves of migration (some of which went back into Africa), before spreading out to the Americas and Oceania. Some populations interbred with other human species like the Neanderthals and Denisovans and even though those lineages are extinct, their DNA lives on in their modern human descendants. We have the most developed prefrontal cortexes of any ape, allowing for a greater degree of creativity and innovation that likely allowed us to out-compete all the other human species and innovate technology and philosophy to a greater degree than any human species.