Which of the following is a valid observation about coevolution of angiosperms and their pollinators?

Options

A. Solitary bee species pollinate different species of plants
B. Moth pollinated flowers bloom only in the morning
C. Most bird pollinators are native to Europe
D. The effective range of wind pollination is 100 km

Answer

To determine which observation about the coevolution of angiosperms (flowering plants) and their pollinators is valid, we can analyze each statement provided in the question.

### Step-by-Step Solution:

1. **Understanding Coevolution**: Coevolution refers to the process where two or more species influence each other's evolutionary trajectory. In the context of angiosperms and their pollinators, this means that plants and their pollinators have adapted to each other over time.

2. **Analyzing the Statements**:
- **Statement 1**: "Solitary bee species pollinate different species of plants."
- **Analysis**: This statement is true. Solitary bees are known to pollinate a variety of flowering plants, and their relationship with these plants exemplifies coevolution, as both have adapted to each other's needs.

- **Statement 2**: "Moth pollinated flowers bloom only in the morning."
- **Analysis**: This statement is false. Moth-pollinated flowers typically bloom at night when moths are active, indicating a mismatch in the timing of flowering and pollinator activity.

- **Statement 3**: "Most bird pollinators are native to Europe."
- **Analysis**: This statement is also false. While there are bird pollinators in Europe, many species are found in other regions, and this statement does not accurately reflect the diversity of bird pollinators globally.

- **Statement 4**: "The effective range of wind pollination is 100 km."
- **Analysis**: This statement is incorrect. The effective range of wind pollination is generally much less than 100 km, as wind dispersal is influenced by various environmental factors.

3. **Conclusion**: After analyzing all statements, the only valid observation regarding the coevolution of angiosperms and their pollinators is **Statement 1**: "Solitary bee species pollinate different species of plants."

### Final Answer:
The valid observation about coevolution of angiosperms and their pollinators is: **Solitary bee species pollinate different species of plants.**

---