Which best describes the cell theory?
a. scientists know all there is to know about cells, so the cell theory will not change.
b. as technological advancements are made, the cell theory may change.
c. a theory, once formulated, cannot be changed.
d. the development of a synthetic cell has caused the cell theory to change.

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