The vector is body fluid exchange
Correction:
Bodily fluids are not technically vectors. A vector is a living organism, usually a mosquito or tick, that is capable of transmissing disease. To date, no vectors have been identified as causing HIV infection.
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Vectors have a direction associated with them, scalars do not.
No. Only in the equilateral case. And then they will only be equal in magnitude, not direction.
Any measurement in which the direction is relevant requires vectors.
It can be any direction. It depends on the magnitudes and directions of the two original vectors.
Take any three vectors in a plane which, when placed end-to-end form a triangle. The resultant of the three vectors will be zero.