Questions: Question 33 3 pts Factors that help to perpetuate temperate grasslands, such as the American prairies, and prevent them from becoming woodlands include large numbers of cacti. periodic drought and fires. mild winters with very little rain. poor soil.

The answer is the second one: periodic drought and fires.

Explanation for each option:

1. Large numbers of cacti: This is incorrect. Cacti are more commonly associated with desert environments rather than temperate grasslands. They do not play a significant role in maintaining grasslands or preventing them from becoming woodlands.

2. Periodic drought and fires: This is correct. Periodic droughts limit the growth of trees, while fires help to clear out woody plants and prevent the encroachment of forests. These factors are crucial in maintaining the open landscape characteristic of temperate grasslands.

3. Mild winters with very little rain: This is incorrect. While mild winters might be a feature of some grassland climates, the lack of rain is not a primary factor in preventing the development of woodlands. In fact, grasslands can receive a moderate amount of rainfall, but it is the seasonal droughts and fires that are more influential.

4. Poor soil: This is incorrect. While some grasslands may have less fertile soil compared to forests, it is not the primary reason they remain grasslands. Many grasslands have rich soils that are very productive for agriculture. The key factors are the periodic droughts and fires that prevent tree growth.

In summary, periodic drought and fires are the main factors that help perpetuate temperate grasslands and prevent them from becoming woodlands.