When a scientist is conducting research about all the plants and wildlife in the mojave desert as well as the desert’s resources, such as water and soil, the scientist is studying
a. a community.
b. a population.
c. a species.
d. an ecosystem.

The table presents the average day and night temperatures in five cities. it also reveals whether a city receives substantial rainfall (wet climate) or little rainfall (dry climate). which city’s rocks are likeliest to experience frost wedging, and why? a) city a because the consistently subzero temperature would prevent water from melting b) city b because it is a wet region and the temperature fluctuates around the freezing point c) city c because it receives plenty of rain fall and the weather is moderately cool d) city d because the hot and dry weather would cause rocks to absorb water