For each of the following qustions four chices have been provided. Select the correct alternatives.
Flat fertile lands dominated by grasses are seen in the__________

Answer

To solve the question about flat fertile lands dominated by grasses, we will follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the type of flat fertile lands that are dominated by grasses.

2. **Identify Key Terms**: The key terms in the question are "flat fertile lands" and "dominated by grasses".

3. **Recall Relevant Information**: We know that certain ecosystems are characterized by flat lands that are primarily covered with grasses. One such ecosystem is known as a "prairie".

4. **Consider Geographic Locations**: The transcript mentions that these grasslands are found in the US state of Colorado, which is part of the larger region known as the Great Plains.

5. **Select the Correct Alternative**: Based on the information, the correct alternative for flat fertile lands dominated by grasses is "prairies".

### Final Answer:
Flat fertile lands dominated by grasses are seen in the **prairies**.

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