Most agricultural waste can be recycled. Composting is a process used to recycle waste. Bio-fuels, such as ethanol or methane, can be made from recycled wastes.
Many processes used in agriculture require different procedures, products, or systems. The procedures and products needed to plant a crop are different from those used in harvesting. For example, propagating and growing require plows and shovels, tractors with planting drills, and irrigation systems. In contrast, harvesting requires shears and hoes, hay thrashers, and baling systems.
Artificial ecosystems are human- made environments that are designed to function as a unit and are comprised of humans, plants, and animals. A farm or a garden pond is an example of an artificial ecosystem designed to use all parts to their fullest potential. A farmer uses the plants, animals, and land to work together for optimum production. A garden pond is designed to use plants to provide food and shelter for fish and other animals, in which animal waste, in turn, is used to help support plant life. In particular, Biosphere II is a closed artificial ecosystem, in which plants, animals, and microbes, are used not only to provide food, but also to filter the air and water for reuse.
Vaccines are designed to prevent diseases from developing and spreading; medicines are designed to relieve symptoms and stop diseases from developing. Vaccines for such illnesses as polio, tetanus, and mumps are used in the maintenance of good health, while medicines, such as those for the common cold, the flu, or pneumonia are used to help ease an illness and restore good health.
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