Why do organisms compete in an ecosystem?

• A. Because competition eliminates the need for adaptation
• B. Because resources such as food, water, and space are limited
• C. Because competition increases genetic diversity directly
• D. Because all organisms have identical needs and behaviors

Answer: (B)

Verified step by step guidance

1. Understand the concept of competition in an ecosystem: Competition occurs when organisms vie for limited resources such as food, water, space, or mates. This is a fundamental ecological interaction.
2. Clarify why resources are limited: In any ecosystem, resources are finite, meaning there is not enough to satisfy the needs of all organisms. This scarcity drives competition.
3. Analyze the incorrect options: For example, competition does not eliminate the need for adaptation; instead, it often drives adaptation as organisms evolve traits to better compete for resources. Similarly, competition does not directly increase genetic diversity; it may indirectly influence diversity through selective pressures.
4. Examine the behaviors and needs of organisms: Not all organisms have identical needs and behaviors. Different species have unique ecological niches, but overlap in resource requirements can lead to competition.
5. Conclude why organisms compete: The correct answer is that organisms compete because resources such as food, water, and space are limited. This competition is a natural part of maintaining balance in ecosystems.