The answer is: <span>the directionality problem
</span><span>the directionality problem refers to a type of problem in which the cause and effect relationship is not known.But even though the relationship is not known, we can now for sure that the problem is exist because it shows obvious effect/symtomps.</span>
Parkinson disease. I think this is right.
Answer: C. Unilineality
Explanation: Unilineality is a system of determining descendant group in which one belongs to either the male (patriline) or female(matriline) both not both. Both patrilineal and matrilineal system are both examples of a unilineal system.
Ambilineal are non-unilineal where individual can be affiliated to more than one genealogical line.
Cosanguinity refers to being of the same descent with another individual.
