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
Food Chains (film) Food Chains (film) Food Chains is a 2014 American documentary film about agricultural labor in the United States directed by Sanjay Rawal. It was the Recipient of the 2015 James Beard Foundation Award for Special/Documentary. In Immokalee, Florida, migrant farmworkers pick fruits and vegetables that are sold to large US food wholesalers. However, their working conditions are shown to be less than favorable. As a result, they form the Coalition of Immokalee Workers (CIW) to raise awareness and improve their circumstances. Specifically, they go on a hunger strike to pressure Publix, a Florida-based food wholesaler, to pay them one penny