Answer:
1. Vegetation can affect climate and weather patterns due to the release of water vapor during photosynthesis.
2. climate and soil
3. Plants break the impact of a raindrop before it hits the soil, reducing the soil's ability to erode.
4a. If the soil is rich and fertile; the population density is often high as people are able to yield good crops. If the soil is thin and unproductive, few people will live in the area
4b. When plants convert carbon dioxide and sunlight into carbohydrates via photosynthesis, they lose water through their leaves
