question:
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?

answer: no

question:
Older adults tend to exhibit deficits on tasks that involve knowing the temporal order in which they learned information; source memory tasks that require them to remember the specific circumstances or context in which they learned information; and prospective memory tasks that involve remembering to perform an act at a future time.
What do most elderly people worry about?

answer: no

question:
In January 2014, having met with Secretary of State, Archbishop Pietro Parolin, Kerry said "We touched on just about every major issue that we are both working on, that are issues of concern to all of us.
How many people did Kerry say had died in Syria as of Jan 2014?

answer: no

question:
The next stage of the plan called for the capture of Midway, which would give him an opportunity to destroy Nimitz's remaining carriers.
How many planes did the United States have in the Battle of Midway?

answer:
no