Hiv can be transmitted through mosquito bites sneezes saunas and toilet seats.
a. true
b. false

The statement that HIV can be transmitted through mosquito bites sneezes saunas and toilet seats is false. HIV can be only transmitted through blood and certain body  fluids (semen, pre-seminal fluid, breast milk, vaginal fluids, ..) . In order HIV transmission to occur these HIV infected fluids must be injected into the bloodstream.  

It would be answer choice b (1975)

The freezing point of the ice is lowered because of the rock salt which then allows the ice to observe heat from the ice cream mixture without it melting.