The tissue layers of blood vessels from outer layer to inner layer are:

The outermost layer is called the tunica adventitia.

The muscular middle layer is called the tunica media.  

The innermost layer is called the tunica intima.

Explanation:

tunica intima is the inner most tissue, tunica externa is he outermost layer of a blood vessel

Explanation:

i think that d. wind is the answer.   i missed the question when i answered a. currents.