<h2>Answer</h2>
- Wind
- Sunlight
- Plants
- Soil
- Coal
- Minerals
- Water
- Animals

In short it's natural resources.
Drive less, accelerate slowly, drive until your tank is empty, avoid excessive idling, eliminate wind resistance.
The main structural difference between LDL and HDL is their compositions. Approximately 50% of the weight of an LDL particle is cholesterol and only 25% is protein. High-density lipoprotein particles, on the other hand, consist of 20% percent cholesterol by weight and 50% protein.
To calculate the population density, you will divide the population by the size of the area. Hope I helped!