Which of the following statements is true about the population in Shelton and Principe

If a particular resource is not useful or needed then the price would be considerably low. once that resource is needed the price or value will raise depending on how useful or needed it is especially if the resource is low in quantity, the consumers would pay whatever they have to, to get that material.

Ibelieve its c.  that to me seems like the closest answer 

Yep, we’re not gonna last that long sadly

Convection current is the main process through which heat is transferred in bulk from one location to another through the cyclic motion of a large volume of substance.