The character and extent of vegetation are mainly determined by:
1. Temperature:
- Temperature affects the growth and distribution of plants.
- Different plants have specific temperature requirements for growth.
- Extreme temperatures can limit the growth of vegetation.
2. Humidity:
- Humidity refers to the amount of moisture in the air.
- Plants require a certain level of humidity for their growth.
- High humidity can promote the growth of certain types of vegetation, while low humidity can limit it.
3. Precipitation:
- Precipitation includes rainfall, snowfall, and other forms of moisture.
- Adequate precipitation is essential for the survival and growth of plants.
- Different plants have different water requirements, and their distribution is influenced by the availability of precipitation.
4. All of the above:
- The character and extent of vegetation are determined by a combination of temperature, humidity, and precipitation.
- These climatic factors interact with each other to create specific conditions for different types of vegetation.
In conclusion, the character and extent of vegetation are mainly determined by temperature, humidity, and precipitation. These climatic factors play a crucial role in shaping the distribution and growth of plants.

The character and extent of vegetation are mainly determined by:
1. Temperature
2. Humidity
3. Precipitation

Temperature:
- Temperature plays a crucial role in determining the character and extent of vegetation.
- Each plant species has a specific temperature range in which it can survive and thrive.
- For example, tropical rainforests are characterized by high temperatures throughout the year, which support the growth of diverse vegetation.
- In contrast, cold deserts have low temperatures, limiting the types of plants that can survive in such extreme conditions.

Humidity:
- Humidity refers to the amount of moisture present in the air.
- It affects the availability of water for plants and their ability to carry out essential processes like transpiration.
- Plants in areas with high humidity, such as tropical rainforests, have adapted to cope with excess moisture.
- In arid regions with low humidity, plants have developed specialized features to conserve water, such as succulent leaves and deep root systems.

Precipitation:
- Precipitation refers to the amount of rainfall or snowfall in an area.
- It is a crucial factor that determines the distribution and density of vegetation.
- Areas with high precipitation, like rainforests, support dense vegetation due to the abundance of water.
- In contrast, regions with low precipitation, such as deserts, have sparse vegetation as plants struggle to survive with limited water availability.

Interaction of Factors:
- The character and extent of vegetation are not solely determined by any single climatic factor.
- Temperature, humidity, and precipitation interact with each other to create specific climatic conditions that shape the vegetation.
- For example, tropical rainforests have high temperatures, high humidity, and high precipitation, creating a favorable environment for luxuriant growth.
- In contrast, temperate forests have moderate temperatures, moderate humidity, and moderate precipitation, supporting a different set of plant species.

Conclusion:
- The character and extent of vegetation are influenced by the interaction of temperature, humidity, and precipitation.
- These climatic factors determine the types of plants that can survive and thrive in a particular region and contribute to the overall biodiversity and ecosystem of that area.