The evolutionary reason a given organism'interacts with another organism is to

Options

A. improve the environment in general.
B. make life on Earth easier for humans.
C. improve its own chance of survival.
D. improve the survival of the organism with which it interacts.

Answer

**Step-by-Step Solution:**

1. **Understanding Organism Interactions**: Begin by recognizing that organisms in an ecosystem interact with one another for various reasons, primarily related to survival. These interactions can be essential for obtaining food, shelter, and other resources necessary for life.

2. **Types of Interactions**: Identify the different types of interactions that occur between organisms. Some common types include:
- **Mutualism**: Both species benefit from the interaction.
- **Commensalism**: One species benefits while the other is neither helped nor harmed.
- **Parasitism**: One organism benefits at the expense of the other.

3. **Survival Needs**: Emphasize that the primary evolutionary reason for these interactions is to improve the chances of survival for the organisms involved. For example, mutualistic relationships can be crucial for the survival of both species.

4. **Dependency on Other Organisms**: Recognize that some organisms are autotrophs (producers) that can make their own food, while others are heterotrophs (consumers) that rely on other organisms for food. This dependency drives the need for interaction.

5. **Conclusion**: Conclude that the evolutionary reason a given organism interacts with another organism is to improve its own chances of survival. This is often reflected in the nature of the interactions they engage in.

**Final Answer**: The evolutionary reason a given organism interacts with another organism is to improve its own chance of survival.

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