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A particular species of protist has obtained a chloroplast via secondary endosymbiosis. You know this because the chloroplasts ________.
Certain Knowledge
Knowledge that is absolutely sure, indubitable, and beyond any possibility of doubt.
Descartes
René Descartes, a French philosopher, mathematician, and scientist, known for his statement "Cogito, ergo sum" (I think, therefore I am).
Astronomical Theory
A scientific theory or set of principles that aims to explain phenomena observed in astronomy, such as the motions of celestial bodies or the evolution of the universe.
Sunset
The time in the evening when the sun disappears below the horizon.
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