Electrochemical reactions and oxidation-reduction reactions are similar because they both:

a. involve the transfer of electrons.
b. must be spontaneous.
c. take place with all reactants in physical contact.
d. require an input of energy to occur.

It's A because they need each other to make a reduction.

If the water vapor content stays the same and the temperature drops, then the relative humidity increases. its vise versa.if the water vapor content stats the same and the temperature rises, the relative humidity decreases. so, yes, i'd say that temperature and humidity have a strong relationship.