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) documentary about the same topic. He concluded that "Food Chains" was 'simultaneously inspirational and deeply depressing.' Writing for the "San Francisco Chronicle", Tara Duggan added that there were 'many chilling moments' in the documentary. In "The New York Daily News", Elizabeth Weitzman called the documentary 'unsettling,' concluding 'you will certainly leave the theater more enlightened than when you arrived.'. Jeannette Catsoulis of the New York Times called the film 'rousing' and 'emphatic and empathetic.'. 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