The pyramid model above shows the organisms in a food chain by trophic level. Upon what criteria is this pyramid model based?

In which situations is the principle of cross-cutting relationship useful in determining relative age?

Why do we perceive objects as retaining their brightness under different lighting levels?

Migration is a. the movement of organisms from a native location to a foreign location b. the movement of organisms from a foreign location to a native location the movement of organisms from their water supply to their food supply d. the seasonal movement of organisms between locations c. select the best answer from above