The evolution of the flowers of a plant and its pollinator species tightly linked with one another is termed

Options

A. macroevolution
B. coevolution
C. retrogressive evolution
D. divergent evolution

Answer

To solve the question regarding the evolution of flowers of a plant and its pollinator species being tightly linked with one another, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the term that describes the evolution of flowers of a plant and its pollinator species that are closely linked.

2. **Identify Key Concepts**: The key concepts here are "evolution," "flowers of a plant," and "pollinator species." We need to find a term that encapsulates the relationship between these two different organisms.

3. **Review the Options**: The options given are:
- A) Macroevolution
- B) Coevolution
- C) Retrogressive evolution
- D) Divergent evolution

4. **Analyze Each Option**:
- **Macroevolution** refers to large-scale evolutionary changes that occur over long periods, typically above the species level. This does not specifically address the interaction between two species.
- **Coevolution** is the process where two or more species influence each other's evolutionary trajectory. This is often seen in relationships like that of plants and their pollinators.
- **Retrogressive evolution** refers to the process where a species loses complex structures or functions, which does not apply here.
- **Divergent evolution** describes the process where two or more related species become more dissimilar over time, which also does not fit the context of the question.

5. **Select the Correct Answer**: Based on the analysis, the term that best describes the evolution of flowers of a plant and its pollinator species that are tightly linked is **coevolution**. Thus, the correct answer is **B) Coevolution**.

### Final Answer:
The evolution of the flowers of a plant and its pollinator species tightly linked with one another is termed **coevolution**.

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