Evolution and natural selection are necessary for

C)  

the long-term survival of an entire species of organisms.

Explanation:

The long-term survival of an entire species of organisms. Individual organisms do not have to immediately adapt to an environment. However, an accumulation of useful mutations is necessary for a species to keep pace with changes in the environment.

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a

b brown mice / white sand dunes