When I say criteria I mean like x biological functions or y genetics.
If it were to be appearance,anatomy. A corpse completely looks like a man. Moreover a person who has had their 4 limbs amputated, has a single largely malfunctioning kidney(they are on heamodialysis), has had every vestigial feature, like the vermiform appendix, wisdom teeth, surgically removed due to health problems. Their digestive function is almost dead. Their eyes gouged out by accident. Has severe problems in their brainstem. They can't swallow, they can't speak, they can't hear, they.....
Basically they only breathe, and have something to circulate because of artifical support. They are almost brain dead.
Even such a person that looks nothing like a man, anatomically. Is definately a homo sapiens. They are actually protected by law. They cannot have their life-support removed or be left to die. At least not in countries like Germany, Italy, Greece, France, Spain,Portugal. Legally any so.
They have every single organ system severely damaged and any more damage to a single organ system would kill them.
What makes a living homo sapiens.