Population growth caused land to be converted from agriculture to other uses. Plant and animal breeding and genetic engineering resulted in new strains and higher productivity. Food availability has been enhanced by technological developments in production, storage, preservation, sanitation and distribution. Agricultural base of food, land and people. A. Many and varied plants and animals are fundamental to agriculture.
Plants are primary producers and have varying life spans - from moments to centuries.
Annuals are plants that complete their life cycle in less than a year. Agriculture involves animals from both land and water. Domestic animals are raised for a variety of purposes. Wild animals are those that are not tamed or domesticated and come from many difference ecosystems. Animals and their products and by-products provide us with food, feed, medicine, research, fiber, shelter, aesthetic needs, work, recreation, industrial and household products.