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Non-fungible items are not substitutable in the same manner. Goods that are fungible are treated as commodities, and markets in commodities are active and liquid because of their fungibility. For example, gold is generally fungible because its value does not depend on any specific form, whether of coins, ingots, or other states. However, a ...
Plants provide the greater part of the food for people and their domestic animals: much of civilisation came into being through agriculture. While many plants have been used for food, a small number of staple crops including wheat , rice , and maize provide most of the food in the world today.
The operational definition used by Dodd-Frank includes "[a]ll other commodities that are, or once were, or are derived from, living organisms, including plant, animal and aquatic life, which are generally fungible, within their respective classes, and are used primarily for human food, shelter, animal feed, or natural fiber".
For example, milk, eggs, and notebook paper are not differentiated by many customers; for them, the product is fungible and lowest price is the main decisive factor in the purchasing choice. Other customers take into consideration other factors besides price, such as environmental sustainability and animal welfare.
Within an ecological food chain, consumers are categorized into primary consumers, secondary consumers, and tertiary consumers. [3] Primary consumers are herbivores, feeding on plants or algae. Caterpillars, insects, grasshoppers, termites and hummingbirds are all examples of primary consumers because they only eat autotrophs (plants).
Food is usually of plant, animal, or fungal origin and contains essential nutrients such as carbohydrates, fats, proteins, vitamins, or minerals. The substance is ingested by an organism and assimilated by the organism's cells to provide energy, maintain life, or stimulate growth.
Kleiber's law describes the relationship between an animal's size and its feeding strategy, saying that larger animals need to eat less food per unit weight than smaller animals. [21] Kleiber's law states that the metabolic rate (q 0) of an animal is the mass of the animal (M) raised to the 3/4 power: q 0 =M 3/4
Consumer–resource interactions are the core motif of ecological food chains or food webs, [1] and are an umbrella term for a variety of more specialized types of biological species interactions including prey-predator (see predation), host-parasite (see parasitism), plant-herbivore and victim-exploiter systems. These kinds of interactions ...