Can someone help me please

In a voltaic cell, electrons flow from the (positive/negative) to the (positive/negative) terminal.

Awave is propagating from left to right in a medium. the particles in the medium are also vibrating from left to right. what kind of wave does this describe? a. longitudinal wave b. transverse wave c. mechanical wave d. electromagnetic wave

In which section of nuclear fussion occura. reactor vesselb. heat exchangerc. condenserd. cooling tower