Atrail pattern leading away from the victim at a stabbing scene was most likely created by:

a. a victim's arterial wound.
b. blood dripping from the murder weapon.
c. postmortem movement of the victim.
d. blood expelled from a respiratory injury.

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

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.

1. is geographic distribution

2 is increasing complexity

3 is transitional forms