What are the properties of these compounds

Which of the following is an example of this type of co-evolution

The energy required to vaporize a certain amount of a substance is greater than the amount of energy necessary to raise the temperature of the same amout of that substance by 1 degreee celcius

The first generation of offspring from the cross of two parents is called the a.f1 generation b.f2 generation c.short generation d.p generation