Marine life appeared in the form of fish, which live exclusively in water. Some of these evolved into amphibians which spend portions of their lives in water and portions on land. Other fish evolved into land mammals and subsequently returned to the ocean as seals, dolphins or whales. Plant forms such as kelp and algae grow in the water and are the basis for some underwater ecosystems. Plankton, and particularly phytoplankton, are key primary producers forming the general foundation of the ocean food chain. Marine invertebrates exhibit a wide range of modifications to survive in poorly oxygenated waters including breathing tubes (see
Short food supply chains France was aimed at supporting the development of short food chains. According to the plan, short food chains are defined on the base of the number of actors involved; precisely : SFSC are considered as « "commercialisation of agricultural products through direct selling or indirect selling when only one intermediary is involved" ». (« "Un circuit court est un mode de commercialisation des produits agricoles qui s'exerce soit par la vente directe du producteur au consommateur, soit par la vente indirecte à condition qu'il n'y ait qu'un seul intermédiaire". » . However, there have been discussions at the senate and