Natural resources can be categorized based on their origin as biotic or abiotic. They can also be categorized based on renewability as renewable or non-renewable. Biotic resources are living and able to reproduce, like plants and animals. Abiotic resources are non-living, like water, land, and minerals. Renewable resources can replenish themselves naturally or within human lifetimes, like water, sunlight, and wind. Non-renewable resources are limited and cannot renew, such as fossil fuels, minerals, and coal, which are considered exhaustible. Some resources are inexhaustible and present in unlimited amounts, like sunlight and water.