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
Dunaliella strain is reported to have oil yield of about 37% (organic basis). "D. tertiolecta" is a fast-growing strain and that means it has a high CO sequestration rate as well. Dunaliella Dunaliella is a genus of the algae family Dunaliellaceae. "Dunaliella" sp. are motile, unicellular, rod to ovoid shaped (9−11 µm) green algae (Chlorophyceae), which are common in marine waters. The organisms are relatively simple to cultivate and do not clump or form chains. The best-known species is the extremely salt tolerant "Dunaliella salina" Teodor. A new species of "Dunaliella" was discovered in the Atacama Desert in 2010. It is