The measles virus and rubella virus are two separate viruses. They have different DNA and RNA structures, and the vaccination for the measles virus only "knows" how to attach itself to measles and destroy the virus. It doesn't know how to attach itself to the rubella virus to destroy it, as the vaccination is needed to inform it how to.
The advantage of vaccinating a large amount of the population is that it reduces the chance someone will catch sickness by a great amount, and can possibly eradicate the virus.
Increase in temperature. I am not exactly sure what you're looking for but basically water vapour in the air has to do with evaporation of water from the surroundings so it will definitely have to do with the increase in global temperatures brought by global warming
A dichotomous key is two paired sentences that have contrasting characteristics. That's all i know
