im not sure if this is what the class is considerd but i know that it avians,aka birds
Answer: B. Blood dripping from the murder weapon.
Explanation: In bloodstain pattern analysis, blood spatters behave in accordance with some scientific laws in relation to what caused the bloodshed, the position of the victim and the perpetrators, and the velocity at which the blood is spattered. Since the blood trail is leading away from the stabbed victim, the blood trail is most likely created by the dripping of blood from the murder weapon
B. Eukaryotic cells
Humans are categorized as eukaryotic organisms.Which means that all human cells can be found with a nucleus. Eukaryotes can found in things like the brain, the heart,the muscles,and such more.