Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Paleobotanists study ancient plants in the fossil record to provide information about the evolutionary history of plants. Cyanobacteria, the first oxygen-releasing photosynthetic organisms on Earth, are thought to have given rise to the ancestor of plants by entering into an endosymbiotic relationship with an early eukaryote, ultimately becoming the chloroplasts in plant cells. The new photosynthetic plants (along with their algal relatives) accelerated the rise in atmospheric oxygen started by the cyanobacteria, changing the ancient oxygen-free, reducing, atmosphere to one in which free oxygen has been abundant for more than 2 billion years.
What can scientists learn from the fossil record?
A: evolutionary history of plants

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The Philippines is a unitary state with some powers devolved to Local Government Units (LGUs) under the terms of the Local Government Code. There is also one autonomous region, the Autonomous Region of Muslim Mindanao. Over the years various modifications have been proposed to the Constitution of the Philippines, including possible transition to a federal system as part of a shift to a parliamentary system. In 2004, Philippine President Gloria Macapagal Arroyo established the Consultative Commission which suggested such a Charter Change but no action was taken by the Philippine Congress to amend the 1987 Constitution.
What type of modifications have been removed from the Philippines Constitution?
A: unanswerable

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Rome's government, politics and religion were dominated by an educated, male, landowning military aristocracy. Approximately half Rome's population were slave or free non-citizens. Most others were plebeians, the lowest class of Roman citizens. Less than a quarter of adult males had voting rights; far fewer could actually exercise them. Women had no vote. However, all official business was conducted under the divine gaze and auspices, in the name of the senate and people of Rome. "In a very real sense the senate was the caretaker of the Romans' relationship with the divine, just as it was the caretaker of their relationship with other humans".
What organization was Rome's official caretaker?
A: the senate

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More-or-less independent circadian rhythms are found in many organs and cells in the body outside the suprachiasmatic nuclei (SCN), the "master clock". These clocks, called peripheral oscillators, are found in the adrenal gland,[citation needed] oesophagus, lungs, liver, pancreas, spleen, thymus, and skin.[citation needed] Though oscillators in the skin respond to light, a systemic influence has not been proven. There is also some evidence that the olfactory bulb and prostate may experience oscillations when cultured, suggesting that these structures may also be weak oscillators.[citation needed]
Where are dependent circadian rythems found?
A:
unanswerable