What is correct about the following graph? Check all that apply. Watch the video carefully!多项选择题

A
This graph shows the different oscillation modes of the universe, and we can estimate the content ratio of normal matter in the universe.
B
This is the histogram of the sizes of radiation patterns in the cosmic microwave background measured by WMAP satellite.
C
From this plot we can estimate that there was 75% hydrogen and 25 % helium.
D
From this plot we can find that the age of the universe is 13.8 billion years.
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