A) those species that increase in productivity outcompete other species.
B) the causes of increased productivity in one species do not necessarily have the same effect in all species.
C) there are inadequate resources available for productivity increases in all species.
D) All of the above
Correct Answer: D
Solution :
[d] Resources are limited. An increase in a resource that benefits one species often causes another species (or several species) to suffer. An increase in resources may mean that one species outcompetes another, that resources are not equally available to all species, or that the increased resources do not have the same effect on all species.
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