At home in the sunlit layer, diatoms are autotrophic--they require energy from sunlight, nutrients like nitrates and phosphates, and carbon dioxide for photosynthesis.
(they; require; energy) Context(they require,List([54, 66))):(diatoms; are; autotrophic; L:At home in the sunlit layer)
they require,List([54, 66))
they diatoms
require are
energy
autotrophic L:At home in the sunlit layer