Competitive exclusion occurs as a result of ________.

• A. two species competing for the same limited resource
• B. random genetic drift in small populations
• C. the accumulation of neutral mutations
• D. mutualistic interactions between species

Answer: (A)

Verified step by step guidance

1. Understand the concept of competitive exclusion: This principle, also known as Gause's Law, states that two species competing for the same limited resource cannot coexist indefinitely in the same niche. One species will outcompete the other, leading to the exclusion of the less competitive species.
2. Analyze the options provided: The correct answer must align with the definition of competitive exclusion, which involves competition for limited resources.
3. Evaluate the first option: 'Two species competing for the same limited resource' directly describes the scenario that leads to competitive exclusion. This matches the definition.
4. Evaluate the second option: 'Random genetic drift in small populations' refers to changes in allele frequencies due to chance, which is unrelated to resource competition or competitive exclusion.
5. Evaluate the remaining options: 'The accumulation of neutral mutations' and 'Mutualistic interactions between species' are unrelated to competition for resources. Neutral mutations do not affect fitness, and mutualism involves cooperation, not competition.