An organism's niche is the role it occupies in an ecosystem. For example, a cheetah's
niche in the savanna ecosystem is that of a hunter of gazelles and other medium.
sized, fast-running herbivores. The principle of competitive exclusion states that two
species cannot occupy the same niche in the same ecosystem. Which statement is true
regarding this scientific principle?
A More evidence is required before it can be accepted as a fact.
B Ecological evidence allowed it to move from a theory to a principle.
C Changing the principle to a mathematical formula would make it a law.
D The principle can be used to support a theory explaining how species change.
