The map shows levels of air quality in parts of the united states and canada. what is a contributing factor to the areas with unhealthy levels?
a) concentration of industrial factories
b) large farming populations
c) exposure to ocean water
d) erosion of beach sand

What will happen to a population of predators if there is a sudden, temporary increase in the number of prey? a. the population of predators will be uniform with no change. b. the population of predators will increase first and then decrease slowly. c. the population of predators will increase continuously.

Give three examples of plant activities that are affected by circadian rhythms and natural fluctuations in the length of daylight?

Ecology can best be described as the study of what