1. Agriculture has to do with farming, cultivating the soil and growing crops, as well as rearing animals to provide food, wool, and other products.
Aquaculture, or aquafarming, has to do with farming of fish, crustaceans, molluscs, aquatic plants, algae, and other aquatic organisms.
2. Recreation has to do with spending leisure time, be it in zoos, aquariums, etc.
3. Biological control has to do with controlling pests such as insects, mites, weeds and plant diseases using other organisms, such as parasitoids and pathogens.
4. Genetic conservation applies genetic methods to the conservation and restoration of biodiversity.